Finally, someone else in my situation! My app was received on Oct 6th and I got my temporary number on Oct 21st, since then I've heard nothing. Have you tried calling IRCC to check if they've checked your application for completeness yet? Mine wasn't done yet as of June 2nd.
I'm a November 5 applicant, received temporary app number on December 10. Nothing else since then. I called last week, gave them my app number, and they told me that an agent entered "DCR Deemed Complete" on March 29th, but that the application was still prospective. They couldn't provide any further information or estimates on when it would begin processing.I spoke with an IRCC agent yesterday, and he was unable to find my application at all,