Not sure why they asked, as IRCC conducts its own criminal background check for applicants in Canada. The criminal record check comes with finger prints. When you go to RCMP, you need to specify that it is for PR. They will hand you a document with your finger prints on it on the spot. If you fail to let them know it is for PR, they will first need to process the criminal back ground check before they mail you the documents which will contain your fingerprints. And depending on how busy they are, it can take up to a month to receive these documents via mail. You can also get your finger prints done by government appointed agents, it depends on which city you are.