GeorgeSoros Since you correctly mentioned the device is released soon, let's just wait and see. GOS is an Open Source Project and donation funded, none of us users is entitled to get any guarantee or information, even if we donated money to the project.
I know these are exciting times and I'm curious, too. We'll see soon how the project adapts to the Pixel 9 launch, so let's wait a bit. They might not even know themselves how much effort it'll be and they probably won't make any promises.
Judging by the past releases, it takes a few days or weeks for the stable release and it's always the most secure and private mobile OS. I don't see any reason to believe it will be different this time.
Keep an eye out on the official channels (Twitter/X, Matrix, Discord, this forum...) and you'll be one of the first to know.