I have my sin and Ohip still. I guess I'll do it all when I landBecause you haven't yet gotten AIP, you might have to wait for your COPR to apply for OHIP. I don't think they will accept the "Processing is now complete" DM letter. AIP or COPR I think is it.
SIN, yeah definitely need COPR in your case. If you had an OWP, you can get a temp SIN, but there is no way you'll apply for that -- you'll land before you even submit it.