When downloading from the "Operator Package Manager (opm)" at https://console.redhat.com/openshift/downloads,
we can download the RHEL8 version of the oc binary, but we cannot download the RHEL9 version.

$ tar tvf opm-linux.tar.gz
-rwxr-xr-x jenkins/jenkins 83615712 2024-09-10 23:09 opm-rhel8

We can donnload the opm-rhel9 via https://mirror.openshift.com/pub/openshift-v4/x86_64/clients/ocp/stable/opm-linux-rhel9.tar.gz

$ tar tvf opm-linux-rhel9.tar.gz
-rwxr-xr-x jenkins/jenkins 83805080 2024-09-10 23:13 opm-rhel9

"Operator Package Manager (opm)" should provide both "Linux - RHLE9" and "Linux - RHEL8".