Hey, mine is still stuck on Submitted too after I linked it to GCKey and the received date for me is showing June 28th in GCKey, but I have a weird issue. My GCKey new PR application which I linked to it shows Primary Applicant with my old name, and not the new one. Does your PR Card application in GCkey show your old name too, or does it show your new name?
Also, call IRCC they can send a email to the right team regarding this. My case, the officer has requested extra time to verify my name change, and that was done on August 28th. Nothing new since then, but the weird issue is that my GCKey PR application shows my old name. I'm not sure if it is the same for everyone else.