Check labels at Pet Valu
They've got "Made in Canada" labels on their shelves for some products, but inspection of some of those products show "designed in Canada, product of USA" or "copyright Pet Value Canada, made in USA".
They have more Canadian stuff than most stores, but their labeling sucks.
We have switched to Global Pet Foods. Canadian company, most locations are local franchise owners, making it local as well.
Good advice.
This will probably get harder to do though as brands start hiding the american side of their products.
I got +90 pet food Canadian mfg's. Here's a search result of 29 specific to cat pet food: https://manufacturedin.ca/?s=cat+pet+food&id=2235