Update on Black Lightning:
So after unsuccessfully looking for the show in Canadian channels and streaming services, I went to iTunes to buy season 3. Typically episodes are available on iTunes a week after first airing. Surprise, surprise, season 3 was not available.
It seems like someone holds the rights for Black Lightning season 3 in Canada but for whatever reason that one does not want the show to show - other than getting cable package that contains WPIX or KTLA.