My flights got cancelled due to Covid-19 and I am thinking to defer classes to September intake. I want to fly as soon as flights open before it gets banned again.
If you are not a Canadian citizen or permanent resident, and do not otherwise have a valid work permit, it is not possible for you to work.
As a full-time student you may be eligible to work on- or off-campus under conditions. But in any case, you may not work in Canada until you start your studies (i.e. after the semester starts).