Found Male Cat – Black Shorthair

This guy has been hanging around my house the past few days. I live in the Oakridge Area, London Ontario.
He has been sleeping on our deck and is very friendly.
He appears to be well fed and is very muscular. He has a shiny black coat and is not declawed. He is friendly and very vocal.
We are unsure if he is a stray, a runaway or simply an outdoor cat. He does not have a collar which leads me to think he is a runaway from the area. Please let me know if you have any information on whether this is a missing cat or if he should just be left alone to enjoy being outdoors and return home when he pleases.
Also I suggest the owner of this cute guy purchase him a collar and tags so that he doesn't get taken in by anyone who isn't his owner.