80 for Brady had a very, VERY strong night locally/regionally. Which is likely helped by this being old white people central. But could also be hindered by the fact that this is Canada, and Tom Brady is certainly NOT a household name here the way he is in the States (and the NFL, while big, not having quite the same cultural impact as in the US). Every comp I have would suggest 1.5M previews (give or take), and the fact that this is consistent across multiple theatres in multiple cities is quite encouraging. But as I said, I do expect this to overindex here.
Knock at the Cabin on the other hand actually had a pretty dismal start if I'm being honest. Comps would range from 1-1.9M previews. But I'm pretty confident that this is staying under 2M previews, or just barely crawls to it. Horror often underindexes in Canada too, so take that for what it's worth.