Good question, I would think the Canadians would just have to wait til tues, I think it would be a good idea to load up and not wait but that my humble opinion. Check out the stickies for your DD. GLTU!
If the US markets are open and canadian markets are closed, your broker in Canada will still be open for business, even if you are using a Canadian bank for your broker. The PR wont be affected since its a US market.