If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.

The oc get customresourcedefinitions (or just oc get crd) command can be used to list your Custom Resource Definitions (CRDs).

~]$ oc get customresourcedefinitions
NAME                                                              CREATED AT
alertmanagerconfigs.monitoring.coreos.com                         2022-02-02T14:12:44Z
alertmanagers.monitoring.coreos.com                               2020-09-30T15:47:27Z
apirequestcounts.apiserver.openshift.io                           2022-07-12T12:10:42Z
apiservers.config.openshift.io                                    2020-09-30T15:40:14Z
authentications.config.openshift.io                               2020-09-30T15:40:14Z
authentications.operator.openshift.io                             2020-09-30T15:40:41Z
baremetalhosts.metal3.io                                          2020-09-30T15:41:05Z
bmceventsubscriptions.metal3.io                                   2022-10-05T10:01:02Z
builds.config.openshift.io                                        2020-09-30T15:40:14Z