https://wccftech.com/face-id-is-finally-coming-to-mac-reveals-macos-big-sur-beta-code/

Touch ID was first introduced with the iPhone 5S back in 2013 and three years later the biometric authentication made its way to the MacBook in 2016. A year later Apple introduced Face ID with the iPhone X and there have been rumors that Apple might implement the facial recognition tech in Macs. Now, it looks like we might see Face ID on Macs in the near future.

9to5Mac has found references to Face ID in macOS Big Sur Beta 3. The code in macOS Big Sur suggests that Apple's future computers will feature support for 'PearlCamera'. PeralCamera is basically the codename that Apple used internally referring to the Face ID and the TrueDepth camera. It was first leaked in 2017 before the iPhone X was released.