If the cluster pods have issue with scheduling you will not be able to delete it because of delete-psmdb-pods-in-order finalizer.

$ k get pods

NAME READY STATUS RESTARTS AGE
my-cluster-name-rs0-0 0/2 Pending 0 11m
percona-server-mongodb-operator-5967b7f957-26v9l 1/1 Running 0 14m

$ k get psmdb my-cluster-name
NAME ENDPOINT STATUS AGE
my-cluster-name my-cluster-name-rs0.test.svc.cluster.local stopping 12m

operator logs:

024-04-30T13:07:04.243Z ERROR failed to delete rs pods {"controller": "psmdb-controller", "object": {"name":"my-cluster-name","namespace":"test"}, "namespace": "test", "name": "my-cluster-name", "reconcileID": "ec153fad-2e22-4a70-bdf9-adfcd0a05c89", "rs": "rs0", "error": "is pod primary: failed to create standalone client: ping mongo: server selection error: context deadline exceeded, current topology: { Type: Single, Servers: [{ Addr: my-cluster-name-rs0-0.my-cluster-name-rs0.test.svc.cluster.local:27017, Type: Unknown, Last error: dial tcp: lookup my-cluster-name-rs0-0.my-cluster-name-rs0.test.svc.cluster.local on 10.0.240.10:53: no such host }, ] }", "errorVerbose": "server selection error: context deadline exceeded, current topology: { Type: Single, Servers: [{ Addr: my-cluster-name-rs0-0.my-cluster-name-rs0.test.svc.cluster.local:27017, Type: Unknown, Last error: dial tcp: lookup my-cluster-name-rs0-0.my-cluster-name-rs0.test.svc.cluster.local on 10.0.240.10:53: no such host }, ] }\nping mongo\ngithub.com/percona/percona-server-mongodb-operator/pkg/psmdb/mongo.Dial\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/psmdb/mongo/mongo.go:112\ngithub.com/percona/percona-server-mongodb-operator/pkg/psmdb.StandaloneClient\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/psmdb/client.go:105\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*mongoClientProvider).Standalone\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/connections.go:56\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).standaloneClientWithRole\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/connections.go:72\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).isPodPrimary\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/smart.go:346\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deleteRSPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:171\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deletePSMDBPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:89\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).checkFinalizers\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:36\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:285\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:114\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:311\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:261\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:222\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1695\nfailed to create standalone client\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).isPodPrimary\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/smart.go:348\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deleteRSPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:171\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deletePSMDBPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:89\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).checkFinalizers\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:36\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:285\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:114\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:311\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:261\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:222\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1695\nis pod primary\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deleteRSPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:173\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).deletePSMDBPods\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:89\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).checkFinalizers\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:36\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).Reconcile\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:285\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:114\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:311\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:261\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:222\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1695"}
http://github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB ).deletePSMDBPods
/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:94
http://github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB ).checkFinalizers
/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/finalizers.go:36
http://github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB ).Reconcile
/go/src/github.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb/psmdb_controller.go:285
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:114
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:311
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:261
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.18.0/pkg/internal/controller/controller.go:222
2024-04-30T13:07:04.570Z INFO Waiting for the pods {"controller": "psmdb-controller", "object": {"name":"my-cluster-name","namespace":"test"}, "namespace": "test", "name": "my-cluster-name", "reconcileID": "ec153fad-2e22-4a70-bdf9-adfcd0a05c89", "replset": "rs0", "size": 3, "pods": 1}

STR:
specify:

nodeSelector:
disktype: ssd

and apply the cr.yaml then try to delete the CR.