TSMC has begun production for the upcoming A15 Bionic processors that should power the iPhone 13 models launching this fall. DigiTimes sources inform that the demand for these chips is going to be greater than any previous version, so TSMC is looking to boost the 5 nm production capacity accordingly. The A15 is produced on the improved N5P nodes.
https://www.notebookcheck.net/Apple-s-A15-Bionic-processors-already-being-produced-at-TSMC.541102.0.html