TVA Montreal on channels 610 and 611 (SD and HD, respectively) - I assume they would be carrying the games. But there are also other TVA Sports stations:
657 TVA Sports HD 661 TVA Sports HD 2
You should grab the Rogers "Home Edition" app for your tablet and smartphones -- will make it easy to find the Habs game by using the search box inside the app. You can also set the games to record on your PVR, even when you are away from home.
Not sure which TVA channels are carrying what games...you may want to visit the TVA or Habs website to find the TV schedule.