During its 2020 WWDC event, Apple revealed it will introduce face masks to its Memoji as part of the new iOS 14 software update that brings in new features and of course new customization options for Memoji.
With having the choice of choosing different face coverings, Memoji in iOS 14 will offer 20 additional headwear, hairstyle, and new-age options. Apple also announced that it would add three new Memoji stickers to send to users on iMessage: a fist bump, a virtual hug, and a blushing reaction.
— Emojipedia 📙 (@Emojipedia) June 22, 2020
The date for iOS 14 is yet to be revealed, but it is probably going to be sometime this fall alongside new iPhones.