For gcms notes , search in google atip notes and apply it online it will take almost a month receive them
processing time is just a indicative time however depends on file and IRCC officer , processing may less or more than 21 months too
To the best of my knowledge
You should call CBSA right away and let them know whole scenario before CBSA takes any action against you
not expert in this matter may other members can help you in this regard