If you know the day you’re moving and new address, you can set up ‘mail forwarding’ through Canada Post for 6 months or more. So, if it hasn’t arrived before you move, it will be forwarded to the new address after you move, along with any other mail. You should set it up with Canada Post about 2 weeks before your move. I don’t think there is a problem with using your friends address, but I can’t be certain. If your move is real soon, you can provide your new address because the PR card usually takes a few weeks to get processed and mailed, but that’s for you to decide. And congratulations!