If reports are to be believed
https://www.tomsguide.com/us/apple-in-display-touch-id,news-28745.html
Apple is considering whether to bring back its Touch ID to the iPad and iPhone,
Patently Apple is reporting, citing reports out of Taiwan. However, rather than offer a physical Touch ID sensor in those devices, Apple is instead planning to bring an in-display Touch ID fingerprint sensor to the devices, according to the report.
Apple is currently evaluating in-display fingerprint sensors from three suppliers — O-film, General Interface Solution, and TPK Holding — the report says. If all goes well, Apple would first bring the sensors to its iPads and then turn around and offer them in its iPhones.