After four years of planning, TSMC is now finally going to make older iPhone processors in the US, but it's not and never will be a true return to American manufacturing.

Taiwan Semiconductor Manufacturing Company (TSMC) first announced its plans to build an “advanced semiconductor manufacturing fabrication” facility in Arizona in early 2020, committing to a $12 billion investment in Phoenix that it later increased to a staggering $40 billion when it committed to a second facility in the state.

Apple is already testing the initial batch of processors produced for its devices by TSMC Arizona, reports Nikkei Asia. To begin with, the tests intend to compare the Arizona output to see if the quality is similar to chips produced in TSMC’s cutting-edge fabs in Taiwan.

Apple is in the "final stages" of verifying the 'Made in America' iPhone chips in the TSMC Arizona factory so it can start using them.

TSMC (TSM.US) ’s biggest customer, Apple (AAPL.US) , is in the process of verifying that the quality of its first batch of chips produced in Arizona is as good as Taiwan's, and the tests are nearing completion,

TSMC's chip foundry in Arizona is not just making one Apple chip, as a second Apple design is reportedly now in production at the facility.

Apple is in the final stage of verifying its first “made in America” cutting edge processor chips from Taiwan Semiconductor Manufacturing Co’s plant in Arizona. The first batch of commercial mass-produced chips is expected as early as this quarter, after the quality assurance processes are completed, people briefed on the matter said.

TSMC's Arizona plant has apparently started making Apple Watch chips. Here's everything we know about Apple US production.