Got the AOR letter in the mailbox today!
Hi everyone! I just checked the status on ECAS, using the application number provided the other day by the IRCC agent.
The second line appeared (finally!!! ): "We sent you correspondence acknowledging receipt of your application(s), and a study book called Discover Canada on December 15, 2020." I guess this makes it official now, I have AOR. Still no sign of the actual letter in the mailbox, but that's less of a concern now.