Hola !!
Well that's good news, and should be fast once they get your passport they stamp it and return it.
I'm argentinian, we've been with my wife to an interview in September, the woman told us it's approved we just had to pay the Right of Permanent Residence in Canada. She told us the confirmation of the payment takes a month or so, it will almost two months soon !!
Can I ask you when did you pay the RoPR fee ??
Sos argentino/a?