Soon apparently. According to dev log #43 (available for a free membership on patreon, same as following him on Itch basically), the update is now in the final stages.
Currently, LopaPhi is just polishing a few things up while his editors edit. Then it will be sent out for translations, proofreading, and whatever else needs doing.
So uhh, the end of next month at the latest? That's my prediction at least it so could be wrong.