since hes already in canada as a visitor, did you sent his passport to mexico city or Ottawa ?
the visa extension is taking around 4 months to get. if you want to apply id do it now just to be safe.
good luck!
I asked for my notes on July 18 and they told me to wait 31 calendar days but I haven't gotten them yet. I guess they are taking longer than what they say.
For those who have requested them lately did you get them around the date they said they would or like 1-2 weeks later? Thanks