Online applicant here. I got my AOR one month after I applied. You never know why your AOR is delayed beyond the usual time of 2-3 weeks for online.I'm a March 15 Online applicant and I still haven't received AOR. Yet I see Paper applicants as late as Mar 9 who received AOR in April.
Check your inbox including spam for emails from "@cic.gc.ca"
You can also call IRCC and ask them for your application number if they have one for you. My guess is the strike added to the delay and you will have to wait a week or so for the IRCC folks to get back to their routine.