Tesla has superchargers along 17 pretty consistently. The biggest gap is probably Sault St Marie to Wawa and that's only 230 km. The rest of the gaps are all well under 200 km (mostly around 100-150) so you don't have to stop at every location. Highway 11 is a no-go zone.

Destination charging is a little more sparse. I use a welding outlet in the family farm shop, but that's obviously not an option available to everyone. There is a single L2 charger on the whole island and it costs $5/hr which is pretty steep for 7 kW.

I wouldn't feel stressed taking a Tesla anywhere along 17 or the whole main trans-canada corridor. I'd want to plan a little ahead if my destination was a place without a supercharger to arrive with enough charge to get back to the network, but that's pretty simple.