Retrax has added the products to their site. They include both polycarbonate and aluminum options with or without the T-slot.
https://retrax.com/products/2022/ford/maverick
Updated with post by @JVolpe showing that Retrax will be producing a tonneau cover:
Saw this update sent by Retrax customer service (same rep too) today:
Original response from Retrax:
I never like to pass along bad news, but I saw over on Bronco6G, but Albert passed away last week.
https://www.bronco6g.com/forum/threads/granger-ford-passing-of-albert-schmitz.18769/
My condolences to his family and friends.