I think your parents PR for cubec.My parents landed in Montreal on Feb.20th, 2022. Once the plane landed they will go inside the terminal, where person will ask if they have ArriveCanada app, and then to the kiosk inside the terminal and answer questions, how many travelers, scan their passport and declare cash and goods. Once they done, kiosk will take a picture of all the travelers and will print out a form. Once this is done they can proceed to CBSA officer, he will check passports and will attach stickers to the passports back side, after this they can proceed towards the exit, next officer took them to a special room where they will fill out COPR and he will cancel the visas and stamp the date on the COPR, after this they can proceed to a COVID test provider site.