It is safer to know IRCC got it in hand and at least get a temp file number, I don't trust Canada Post these days after so many strike and on some website people complaint packages misdelivered or delivered to wrong places etc, it is just too important to me for that to happen, I have been waiting 11 years before I can submit this appIf you have paid for tracking and know it has been received you could also just wait a few weeks for normal processing.