Have you received AOR? A letter or email saying they have your application and are working on it?
If so, you have "implied status" and provided you don't do something silly like leave the country, you're okay until you get a decision on your OWP. If your OWP is approved, your status is fine until it expires.
If for some strange reason your OWP is refused, then it's a different story but that's unlikely if you have AOR.
If you don't have AOR, you need to apply to extend your status in Canada.