I just ordered my winter package last night for a Model 3 I took delivery of a week ago. I had some technical issues with shop.tesla.ca that prevented me from ordering prior to that. Website currently says 4-6 weeks for delivery, so I guess I'm looking late January / early February. Hopefully we won't get a huge dumping of snow in the GTA before then.
Hopefully they do, I'm not planning to store my tires with them either and I don't want to mess up the back of my Model 3 with tire dirt. I guess I should have a couple of drop cloths in the back just in case...
Also, it appears that Crappy Tire has a
set of 4 tire covers for $45 that will fit the 18" set so that's always an option if you want something a bit more durable than plastic.