I've been driving along I-90 regularly from MT-WA, but not in BC. Obviously, there are fires along that route as well. Hopefully, you have a good in cabin air filter in your truck/car. Running AC with that on helps a lot even when there is a lot of smoke.
Some thoughts that might be helpful. Conditions vary a lot, so there is going to be a bit of luck no matter which path you take. For example, Friday, visibility/smoke was less than 50 yards in some areas around Vantage. Yesterday, visibility was probably at least 500 yards through the same area. I think it mostly depends if it is going to be windy or not. Still air seems to have more smoke at my place in MT as well.
This page has the BC wildfire closings along with links to the webcams that are useful for current conditions.
https://www.tranbc.ca/current-travel-advisories/
'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.
NRA Life Member, CCA Life Member