I got PPR on march 18 and I mailed PP on Mar 22. They received it on Mar 25 and it was stamped on Apr 02. I am not too sure when are they gonna mail me back but you should try submitting your query through webform or call them.
I applied on Feb 26 and still waiting for AOR. I submitted a webform but they just told me that they have received the application and that they are processing it according to the date applications were received.