I think schools are very important to children. It is a topic that all chief medical officers are seized with. This is of course in the jurisdiction of the provinces and depends on the epidemiology in the individual location. You might expect schools in Newfoundland to be open in different periods than those in Ontario, for example. It is very much a provincial jurisdiction and a lot of it depends on the epidemiology of what's going on outside that school, not necessarily focusing on transmission in schools.
I do think that now that vaccines are available, teachers getting vaccinated would also help those safe returns to schools.