Is there a mechanism to submit my app for approval to make sure Apple approves it, but then release it to the market at a time of my choosing?

I do see there is an "Availability Date" option. Which could work, but I need confirmation on the way I intend to use it: Set availability date far in the future (12 months) and submit my release ALPHA1 to app store Once I see my app is approved, then I will continue with normal development and make a release BETA2 5 days later I would want the BETA2 release to go live immediately and for the ALPHA1 release in the future to never occur.

I have been testing my flutter app using store kit. However now I want to test in sandbox. I have deployed the app using Xcode and flutter's way. Yet my app does not see the consumables I have created in App Store Connect. Some questions: I have not submitted my app for review, would this prevent me from testing my consumables? The status of consumable is "Ready to Submit" What precisely does "development signed app" mean? Using https://pub.dev/packages/in_app_purchase

Starting on Sun Nov 20, I have not been able to install apps via Testflight. Seeing "The requested app is not available or doesn't exist" on my iPhone. There is a yellow issue under App Store Connect-Performance: https://developer.apple.com/system-status/ Anyone else having issues with Testflight?