Landing is one of the easiest parts of this whole process. My wife landed in Pearson Terminal 1. You go to the CBSA officer and tell him you would like to do your official landing and present him with your passport and COPR. He will direct you to the secondary area where you wait in line again to get called so you can do your landing. You give the officer your COPR and passport. The officer will ask you some really basic questions which all you have to do is answer honestly (questions like "have you been convicted of a crime recently", "do you feel healthy", "was there any change in your family status", etc). Then the officer will ask you for your address in Canada - this is important since this is the address your PR card is mailed to and pay attention that the officer writes it down correctly (the officer who did my wife's landing wrote down the wrong postal code so I pointed it out and he corrected it). Then the officer will have you initial in a few places and both you and the officer will sign both copies and he'll keep the copy with the photo on it and you keep the other. Then the officer will welcome you to Canada. Where my wife landed, there was a SIN kiosk across the room and the officer told my wife to go there and present her passport and her copy of COPR so she can get a SIN number right then and there. So she did and got her SIN number minutes after her landing. Then as you leave the area, some employee there gave my wife some booklets on Canada and a little bag to welcome her to Canada. Then we went to baggage claim, got our bags and went to customs where the customs agent asked her if she had over 10K in cash or anything else to declare. We provided a completed B4 form but the agent didn't seem too interested in it and said we didn't need one. But it is still a good idea to have a completed B4 form when your land anyway IMHO. After we left customs, that was it.
So 90 minutes after getting off the plane, my wife was a PR and we were leaving the airport. Of the 90 minutes, 12 minutes was the actual landing + getting a SIN number + customers, while the other 78 minutes was waiting in various lines.