Departing on TG "J" will have access to the Infinity Showers. However the challenge is TG is the "other" terminal so when you get off the plane there are staff there to direct your transfer. I refused as I wanted to hit the BR lounge and not TG lounge - there are no transfer desks open at that time so I ended up having to hit the TG gate early to get an onward boarding pass as I wasn't issued it @ YYZ, BR9 may treat you differently