It would probably go through Ottawa, unless they decided to keep it at Mississauga. It's rare for them to do that though. Ottawa (I'm a July 2014 applicant myself) is roughly 8-10 months at the moment. If you are lucky it could be 6 months though, that would mean no hitches in your paperwork. SA happens in about a month or so, then it's literally waiting for the most part before they process it. (They started processing mine March 31st.) After that point your guess could be as good as anyones how long it would take. On average from IP-DM I think it's like a few weeks, max a couple months. I would suggest, since he is American, you definitely do OUTLAND though, since INLAND takes 2 years+. Sure you get an OWP after like... 4 months I think? That was just a bit too long for my husband and I. (I'm also American.)
I wish you lots of luck, it's worth the wait. It takes awhile, but tons of people are waiting too, so you'll have tons of support!
EDIT:
I should also point out, that if you wanted to travel after he got his COPR and landed, you'd have to wait for your PR card (that is a whole other ballgame of waiting. It's something like 4-9 months? It's crazy.) unless you plan to go to the states by car. Unless you filed for a PR travel document, and I am NOT sure how to do that.