Even though I am in SoCal and I have not received my P90D yet, I am going to install the floor mats in my X. I contacted them today and this is the response that I received.
Thank you for your interest with WeatherTech.
The mats for the Tesla X are currently in development in our studio. We expect to see this item become available in approximately 8-10 weeks. We will keep your information on file and contact you when the parts are available. If you have any further questions, please feel free to let us know.
Thank you!