Good evening, folks. I'll pile on with my situation. I'm also stuck waiting for my interview in Montreal. I'm EB1-C DQ date is June 28, 2023. As the above poster described, I've heard nothing except the 60 days "please be patient" email.
My only complication is my E2 Visa expires Dec 2024, really hoping to get this taken care of this year, or I don't know how I will enter the country until GC is approved.
Good luck!
CS AZ