I don’t think provinces will know for sure until the pump is released. For example, BC covers the OmniPod and, if that doesn’t work out, will cover the 630G (possibly at extra cost, and not covering the CGM costs). There is no specific mention of the t:slim as it isn’t released yet, but I may try to get coverage through Pharmacare.
There is no central place to see what is covered since healthcare is determined by each province. You’d have to go to each province’s Ministry of Health pages and read up on whether pump coverage is coverd.
I can say for sure that no province covers CGMs or CGM supplies. So that would be a totally out-of-pocket expense regardless of which province you lived in.