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You should receive an email within 30 minutes notifying you that
your build has been validated and is available to release to testers
on TestFlight. At this point you can choose whether to release
on TestFlight, or go ahead and release your app to the App Store.

Release your app on TestFlight

TestFlight allows developers to push their apps
to internal and external testers. This optional step
covers releasing your build on TestFlight.

Navigate to the TestFlight tab of your app’s application
details page on App Store Connect.

Select Internal Testing in the sidebar.

Select the build to publish to testers, then click Save.

Add the email addresses of any internal testers.
You can add additional internal users in the Users and Roles
page of App Store Connect,
available from the dropdown menu at the top of the page.