It’s been over 2 days for me as well.
I have an idea. There are quite a few others who are waiting for access to this application. Reviewers such as Brandon Butch, Zollotech and others have access to the app and looks like they got access quickly. Even though to be on the developer beta, you do not need to pay the yearly Developer subscription, maybe these reviewers have a paid developer account which gave them first access to the application. Users who do not have a paid account access may come a bit later.
I am anxious to get this as well.
One thing I have noticed, if you soft press on the Playground app on an iPhone you get options to remove the app, face ID, and edit home screen. I have an iPad, when I do the same. Thing, I get the same options but I also get a small photo gallery
with the heading Playground that shows a few of my photos. Selecting a photo from the pop up, opens the Playground app and gives the Early Access Requested prompt. Anyone else get this Playground gallery pop up on either an iPhone or an iPad?