Good question and is one I have to.
Problem is here that ofcourse programmer Koen has another job nowadays eg any update has to be done in his free time.
I know Barry wants to get it completed to but also realize his focus is now on production.
I also think a final wizzard mode is almost unachievable, at least for me. I would prefer more smaller things to do, make nihilist wizzard more attractive, program extra ball, have a Bunny mode, etc (I made a spreadsheet which everyone can see as I shared it earlier). So spent time on things us human beings can enjoy and not only the few pinball gods on this planet.
Back to topic, I think it will be finalized but see this for 2021. I do hope However in 2020 we see smaller updates to make it even more enjoyable.