The same food you get elsewhere, but trucked in? Like, literal grocery stores from the same chains you get in the city?
Yes, there's lots of farming, although it depends where exactly we are talking about. Peace River? Somewhere in the Yukon? Too far north, although in an emergency you could grow gardens I guess. In the foothills of the rockies? Too hilly for today's big farms, but in an emergency, I don't see why not. Edmonton or Calgary area? They're surrounded by farms on all sides.
As I said, this part of Canada is a huge place. I think farming is quest canon, though.
You could probably do subsistence farming normal vegetable patch foods easily enough. Cash crops like canola are pretty common right now, but post impact they'd go back to grains almost certainly, and it's common enough now regardless. Farm animals are often kept more as hobbies than to make $ right now as they're farmed industrially, but you could keep them going and they'd feed families. We have a fair bit of cattle ranching in certain parts.