According to reports from China, Apple will start mass-producing displays with an in-screen Touch ID sensor that will complement Face ID in anticipation of their inclusion in the 2021 iPhone series. The upcoming displays will likely have a custom Qualcomm ultrasonic fingerprint sensor, which will have a larger recognition area than comparable sensors found in current flagships like the Mate 20 Pro, P30 Pro and Galaxy S10 series.
https://www.notebookcheck.net/Under-screen-Touch-ID-Face-ID-iPhone-to-enter-mass-production-by-2021-New-report.428725.0.html