They will send your application back as it is incomplete. The application guide very clearly says that you need to include two pieces of ID, one of which can be your passport but can't be your PR card. You only included one piece of ID (your passport) but if you didn't include anything else, I wouldn't waste time waiting for them to send back your application but instead send a new application with the same receipt and a letter of explanation (and of course, the second piece of ID).
https://www.canada.ca/en/immigratio...bsection-5-1-adults-18-years-older.html#Step3
They don't even need to bother with a letter of explanation. It will be a long time between when they send back the already sent application and when they get to the newly sent one.