Apple already is in the process of moving "most" chip production to Texas Instruments in Sherman, TX.

https://appleinsider.com/articles/25/08/22/apple-chips-to-be...

Per that very article, Sherman will be for support chips for power and peripherals, on legacy 45nm+ nodes.

Apple's investing heavily in the TSMC fab in Arizona, due to open in 2027, to have 3nm capabilities for its flagship chips, but it's unlikely that would ever cover a majority of that chipmaking.

https://www.aztechcouncil.org/tucson-chipmaker-tsmc-arizona-...

https://wccftech.com/tsmc-plans-to-bring-3nm-production-to-t...