I believe it was around 42% before game one so that is a big jump. Of course this is based on BPI and I don't think that accounts for Gobert being gone.
http://www.espn.com/blog/statsinfo/post/_/id/131082/bpi-playoff-chances-for-nba-teams
Speaking of Gobert it still sounds like we aren't really sure if he can make it back. I would guess that best case scenario would be game 5, and more than likely that he wont be back. But it seems there may be some room for optimism.