Canada made an exception for offshore labour because they are so essential to agriculture especially and southern Ontario farmers rely on them. The benefits to the economy locally and to their home areas is huge as well. The farmers are responsible for and need to ensure that the workers are isolated for 14 days upon arrival.
Quite innocently, I had been buying items on sale, as Steve mentions, and storing or freezing them so have enough protein, beans and meat, TP and tissues, shampoo etc., for several months. I pressure canned tomatoes, salsa, applesauce, beet and dill pickles and froze fruits last fall. When I saw flour and sugar on sale earlier this year, I bought enough for a 6 month supply. Lots of yeast for bread. Most of the time, I only feed myself so the demand is comparatively quite low but I do donate prepared food to various gatherings throughout the year.
That said, I will need fresh veggies, eggs and olive oil in a another week or two. I have a 5lb bag of powdered milk and canned milk to make my morning yogurt but will need a fresh carton of commercial yogurt to supply the bacterial culture. I have never tried to make yogurt from my current homemade supply. I may just experiment this time to know.
Locally, the shelves are empty unevenly, hit and miss, and reports of the older adults shopping times indicate a limited turnout but disappointing supplies at the early hours.
It all is a wake-up for the just-in-time shoppers each week. I think that is what triggered the hoarding impulses. People got scared. I wasn't inclined to hoard because I have practiced maintaining an inventory for years. Different approach for different folks.