I signed up to this forum just to say that I, as well, haven't received that famous notification, and yes, I have reserved my free Windows 10 copy, and yes, I have the Get Windows 10 app installed, and yes, my pc is marked as fully compatible, and yes, the $WINDOWS.~BT folder weighs 6,40GB. But I still ain't getting Microsoft's attention.
Thing is, I don't feel like "rushing things" with updating from the Media Creation tool. I half believe that if I haven't received the notification so far, there may indeed be compatibility problems of some kind. Maybe minor, but still. I have seen some user feedback on Reddit, and some stories scared the hell out of me.
So, nothing much for me to do: sit here, rant a little bit, hammer the "check for Windows update" button, and wait (im)patiently for the day that little popup comes.