Well, someone said people get test invites around 90 days from when the BG checks were set to "Completed". However, I'm not sure how true this is. My Background Checks were set to "Completed" on March 9th. My GCMS showed my application moved to "Test Ready" status in Mississauga office on March 24th. Makes me think the test invites might be sent out around the 90 day mark from when the application went to "Test Ready" status (again, no evidence for this, just putting the possibility out there) which means I could, perhaps, receive a test invitation on or before 24th June.
Without a sizable number of applicants reporting this, we can't arrive at any conclusions.
My BG was completed on January 20,2021 and no updates since then.
I called IRCC today and they told me that the ottawa office received my apllication on May 18th, 2021. I hope I will get a test invitation soon.