From the CLI:

You can change kubectl for oc since you are using OpenShift.

First find the name of an olm-operator pod. I'm assuming Operator Lifecycle Manager is installed in the olm namespace, but it might be "operator-lifecycle-manager".

kubectl get pods -n olm |grep olm-operator

Then run a command on that pod like this:

kubectl exec -n olm <POD_NAME> -- olm --version

From the Console:

Navigate to the namespace and find an olm-operator pod. Open the "Terminal" tap and run olm --version.

In either case, the output should be something like this:

OLM version: 0.12.0
git commit: a611449366805935939777d0182a86ba43b26cbd