Best bet would be to check crutchfield.com. I know they have them for the 2016.
That said, I was curious, and went there, and it said for both a 2017 and 2018 sedan that radio replacement wasn't recommended due to electrical limitations or something. I'm guessing that what that probably means is maybe they don't have harnesses for them yet, or maybe don't have faceplates for them yet. However, you might be able to go for new speakers or something and give the system a pick me up.