Gluster 9.0 was released a while ago. 9.2 was recently released so I think it's safe now to upgrade (as there's been at least one minor release now).
We have to do https://docs.gluster.org/en/latest/Upgrade-Guide/generic-upgrade-procedure/#offline-upgrade-procedure so it's easy to upgrade just requires some down time for the file storage.
If it isn't a taxing process and just requires planning and communication for an upgrade window, I'll assign it to you and add it to the goal tag for this half. Feel free to proceed with it whenever you have sufficient time to make such plans.