I have received the biometric update on my S20. I see that this is the latest security and biometric patch.
Check settings -> Biometric and security -> more settings biometric -> biometric and securitypatch.
For biometric: 18.104.22.168 (latest)
For face-ID 22.214.171.124 (latest)
Any precautions to be taken or is it legit update from samsung?