Apple's top supplier of chips for multiple purposes, TSMC, will reserve no less than 80 percent of its 5 nm production capacity to the tech giant headquartered in Cupertino. In addition to the existing chips, TSMC is also going to make the upcoming A15 Bionic that will power the upcoming iPhone 13 series.
https://www.notebookcheck.net/Apple-secures-80-percent-of-TSMC-s-5-nm-production-capacity-for-the-coming-year.511153.0.html