This all sounds GREAT! However I have yet to see ant website ‘offer’ Sign In with Apple?

App/website participation is a prerequisite.

I haven't come across one website yet.

This will help those who do not want to sign into social media apps and then "Login with Facebook feature".

"Sign in with Apple is available with participating apps on Apple devices with the latest software—iOS 13 or later, iPadOS 13 or later, watchOS 6 or later, macOS Catalina 10.15 or later, and tvOS 13 or later—and with participating websites in Safari. You can also use Sign in with Apple with other web browsers and on other platforms, like Android or Windows."

https://support.apple.com/en-us/HT210318

Where are you expecting to see this? More information would help.