Oh come on, everybody's making that joke.
Just look at the icon.
It took me the better part of the day before I could see on the site my eligible devices. I'm going to shy away from enrolling my daily use Pixel 4 XL, so I enrolled my 3a XL.
And even then it kept saying it could not enroll me at that time. Took a few tries before it finally took.
I'll admit, I've been a little 'pre-occupied' to keep up with what's new, so this will be a pleasant surprise diving in.
To prep yourself, you can read over their blog here: https://www.blog.google/products/android/android-11-beta/
Have you installed it yet? What do you think?