You must receive your landing paper or permanent card before you update your status at the University of Ottawa. Once you get it, you may go to the school of graduate study to update your status if you are a graduate student; or you may go to the infor service if you are a undergraduate student. Regularly, because you are permanent resident now, you need only to pay the PR tuition fee instead of international student tutiion fee. This means if you can get your PR status in time, go to above office, you will get your almost 45% tuition money back!
Good Luck!