I'm on a iMac 14,2 build, I generated the latest firmware version number and date and manually updated my config.plist in CC as a safeguard against getting a "firmware update required" error I noticed some have seen. I do not know if this was an essential step, I just did it to save myself any bother just in case. The firmware version I was using, was slightly out of date (2017).
I uninstalled my Nvidia Webdrivers before running a standard upgrade from App Store, then simply installed the newest after the upgrade completed. Time machine is now backing up and I'll CCC the drive later.
I am still on Clover 4533 and HFS. Everything is still working golden.
I could really use some advice on the newer versions of Clover and changes there and if I should be thinking about making alterations already for good practice in 10.13.6 and in prep for beta test on 10.14.
If someone could point me in the right direction on that, I would appreciate it.