My speculations is 90% done, what a see for past updates of this game, 90% or even more, i think he's doing his best to be perfect. So don't worry
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Judging by his Trello(if it's accurate) it's probably closer to 30-40% just by eyeballing it. Given that it's been over five years since the last major update and over two since Christmas it does not bode well for anything soon. I'm still not expecting anything before the end of the decade if he does not get burnt out before then.
He's talked about having bottlenecks with the story direction, it's kind of hard to come up with a fully original story and content without having to rely on lewds instead of actual plot or storylines. The only thing I know is that this project is going to take a long time but it will be worth it when he's finally finished. Good luck to the dev and please respond on the comment section more often komisari have a good day.