Dealers are allocated Corvettes based on previous sales. So it's important to get on the order list of a large Corvette dealer. A smaller dealer may take an order but that does not mean you'd get a car any time soon.
A dealer that's open about this will tell you what their expected allocation for the year is, and where you would be on their list. The large dealers can arrange for delivery at a dealer local to you.
As for chances of getting a car in 2020 if you haven't started the process yet, probably slim, but I'm just guessing. There are people on this forum who would answer that better than me.
As for large dealers in Ontario - there's 2 biggies - Wilson Niblett in Toronto and Brian Cullen in St Catharines. You could talk to them.
Even to get a car in early 2021, I'd be getting on a list now if I was you. I joined a list in January 2018 and I wasn't #1. But early enough to be included in the initial order group.