Apple has booked TSMC's initial production of the first next-generation 4 nm process node wafers according to Digitimes. The first chips to roll off the production line will be destined for Apple's Mac line, which of course includes its MacBook Pro models and iMacs.
https://www.notebookcheck.net/Apple-books-out-initial-production-run-of-next-generation-4-nm-wafers-from-TSMC-for-its-new-Mac-chips.530212.0.html