It shouldn't take more than 10-15 days (including Canada Post delivery timings),
unless they got some criminal record hit as in that case it would take bit longer (check their processing times at
https://www.rcmp-grc.gc.ca/en/processing-times-and-fees). Reach out to RCMP's CCRTIS department to check the status of your report, and how to contact that department is given in the section :
Optional: Verify the status of your application, in the following link :
https://www.rcmp-grc.gc.ca/en/steps-getting-a-certified-criminal-record-check
The "Contact us" link will direct you to send an email at :
ccrtis-scictr@rcmp-grc.gc.ca