if you go to that secluded place, don't forget to tailgate the beer in the massive parking lots, and for the long wait to leave after the game, there's time for some more beer for your passengers, and also your watch will read 4:20.
If I finish work at 5pm leaving from either NDG or Ville st. laurent (2 offices) could I get to the game on time?
No, because the Scotiabank Place is located at the extreme west part of the city, in Kanata.
Basically, when you enter Ottawa from Montreal, you will still have to drive another 30 minutes on the highway before you get there. Plus as someone else said, there will be traffic. I suggest you leave work a little bit early (if possible).