I've started working on Rejuvenation Extreme, it will include gen 8 and will be released sometime after v13.
I've learned a lot since the release of Reborn Extreme so I'm convinced that this will be a much better version of the mod, and then once E19 releases I can finally fix all the problems Reborn Extreme had.
Regarding progress, all gen 8 pokemon have already been buffed and I've already started doing trainers, I'm up to Valor mountain.