Will EA Play Pro members still get the Premium Battle Pass when playing on Steam

No worries - that was sort of the expectation that I had initially.. I suspect you're right about that process.

After I saw your post I scoped out the various EA play pages on steam/origin and then noticed this when you go to sign up for a membership initially.. It specifically notes that a membership is for either Steam or Origin, so I don't see any reason that Apex arriving on Steam would change that separation. Easy enough to sign into Origin one last time for anyone who already has an EA Play membership but for some reason just can't stand the idea of using Origin anymore? lol