I think it would take alot more than an average furry vn game. Since each update isn't that major compare to others vn game (no hate). but I asume this is currently only 30-40% progress of the game since there is alot of missing content for the variety of each character, their race and their domestic issue, so I think it either took another 4-5 years for the release (I doubt it will took shorter than that) or maybe it can be as long as Hyao wanted it to without any specific amount of updates for it to be released. (reminded me of One Piece Imao)
Anyways, I would love it if Hyao would check this comment and announce the Release date of the game or atleast confirm some of my opinion was correct.