Any amount of mask wearing will lower the R value. 50% wearing surgical masks still drops the R from 2.4 to 1.5 in the model. That's massive. With the delta variant having an even higher R value (I've seen between 5 and 9), that effect will be even greater.
Alberta is stopping most of it's testing in two weeks and at the end of August (right before school starts, conveniently) the only way to get a test is going to be if at a hospital after you've been admitted or a doctor's office. You also don't need to quarantine or wear a mask if you do test positive anymore. Vaccination rates are about 50% in all of rural alberta, as low as 40% in some areas. Buckle up folks.