I haven’t gotten accepted here, but I was at a different school. I’m in the same situation, and it doesn’t take too long. You just need the admissions letter, financial aid documents and bank statements (loans/student line of credit from Canada) and you’re good to go. The school will give you an I-20 I believe, then you go to the border and get the F1. So even if you get accepted a bit later you’ll still have time. And I’m sure they'll be patient with you, if they accept you really late. I hope you get in, after that everything else will work itself out in time. So don’t get stressed early.