For people who were once asking if the date of reception is the date the mail arrives or the date when the AOR is issued here's what I found:
"If you apply by mail, the processing time starts when your application arrives in our mailroom."
https://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1474&top=3
Now they are working on the applications received from 22nd September to 28th of September 2019, My application was received in the 27th of August 2019, which means they are not putting real dates there.
My status now: Background check completed, test completed, prohibitions in progress, language skills in progress, physical presence in progress, Oath not started. last updated 23rd of April 2021.
Are we a lot from august 2019 who did not get to the end of their application yet?