When will Texas be able to add their driver license in Apple Wallet?

Whenever the whoever is responsible for approving such things in Texas approves it. No one here in this user-to-user forum would know when that would be, though.

Texas doesn't appear to be considering it at the moment, though:

https://9to5mac.com/2024/02/08/apple-wallet-digital-ids-support-states/#:~:text=As%20it%20stands%20today%2C%20only,details%20of%20their%20implementations%20here.