1: these things take time
2: they are done for free
3: Rovo also has a life outside of development.
By you saying "been 3 months since and update; this is useless!" You're telling us and the world that you don't care about Rovo or their life, you just want the project to be completed ASAP, to which I told you that anybody can learn to code android so if you're that desperate to have it working you can always take the source code and build from it for your device. Yea, stock ROMs have issues, because there are so many different ones and Rovo needs to make framework for each and every one of them. It takes a long time.
Xposed for nougat took a year or close to it, at least we have what we have here for Oreo already. Take it or leave it.