I poked around, if you're set on Michelin Pilot Super Sports, you're out of luck. Seems everyone is out of the 245/35R21 and 265/35R21 tires in the T0 Tesla spec (i.e. with the sound reduction foam).
I found the 245/35R21 available at TireRack without the sound reduction foam, but apparently the 265/35R21 isn't available without it.
I would have recommended using the PIlot Sport 4S instead of the Super Sports, as the 4S is newer and performs even better than the Super Sport, but the 4S is not available in 21" sizes yet.
Your only other options would be the
Pilot Sport PS2, the
Continental ContisportContact 5P, and the
Pirelli P Zero 4. The PS2 is an older model tire, it would be outperformed by the others. The ContiportContact 5P has sound reduction foam in it, and was used as the OEM tire by Tesla for a while, so it's a good performer. The Pirelli P Zero 4 is brand new and is meant to compete with the Pilot Sport 4S, that's probably the tire I'd choose if you couldn't wait.