He was progressing really fast , so its probably late June at least hoping it is but something could come up and the game could be delayed. He will probably update progress or drop a teaser soon.
To be clear, we're thinking June because it follows his usual pattern of posts, but we have to take into account this is completely different from the usual VN's he publishes and that he literally told paying subscribers to fuck off and cancel for the month of June considering he still has a fairly hefty workload he plans to finish this June. That includes drawing 8 scenes, rewriting some dialogue and the ending, adding bonus outfits, and finally animating and bug hunting. After that its localizing and a final playtest. Not to mention Arataka's wording suggests VA work *might* be post-launch content too.
In other words hope for June, but expect it to be in July