Wow, opposite situation. I'm from Toronto, trying desperately to go to uni in London! UofT is my first option if that doesn't work out for me.
I don't know if it helps for international applications at all, but I have quite a few friends at UofT. They generally applied early January, and had acceptances by April at the latest. I think that, no matter when you apply after about October, you'll get a response at about the same time as everyone else, ie. March/April. They do acceptances in two "waves" - March, then they see who accepts the offers, and then May or June for anyone who didn't get the first offer and that they have leftover spaces for.
Also, Canadian applicants have to send a "transcript" of their entire secondary school history and grades. If acceptance were based on that, I would never be accepted ANYWHERE. Luckily, they don't consider anything other than the six mandatory grades unless you're looking for early (December) acceptance. So, if you end up being required to send in the marks for your modules, I wouldn't be too worried about it being taken into consideration.
Also, UofT really likes to encourage international applicants, so they'll hopefully be pretty accomodating for you. And I'm sure Toronto would be lucky to have you! Good luck.