Hello Stokell! Not sure if you even still have this bike as you posted quite some time ago.
I just picked up a bike with a similar description. Supercycle, as I'm sure you know, has been a Canadian Tire brand of bicycle for many years. I believe they've always farmed out their manufacturing so it's not surprising to see a Made in Poland label on one of their bikes. These days, it's like "Made in Taiwan."
I don't know if this bike is actually fitted with a Sturmey-Archer hub. It DOES have an internally geared rear hub with 3 ratios but I see no markings on it to indicate the brand of hub or shifter. I'm going to do some more research on this to see just how many internally-geared hubs existed from that era.
If you have some photos, I'd love to see them! I'll post a few once I get this bike cleaned up.
Cheers!
Chris