+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
There is no way to check if the PR card has been sent. You just have to wait for it to arrive by mail.
 
Guacamole said:
How do you know if they have sent you the PR card?

Can you check it in your immigration status?
Ecas will say your application has been completed and a card mailed out.