Play Console: How does "Internal Test Track" work after completing Review?

I intend to distribute my app for testing to a specific list of users.

I have setup all that is required to be able to 'publish' for testing. I then went in App Releases > Internal Test Track and all the way to review.

I now have a screen as below and am not sure what to click on next.

Create Release seems to just take me to the same Internal Test Track setup, for another test release.

I'm not sure of clicking on Release to Alpha as that was another option inside App Release so I'm guessing thats a level higher than Internal testing

Should I wait for a few hours before the specified users can see the app in the play store, or is there some other step to take from here?

In the main menu, under All applications the summarised list of apps shows their status; in my case status is Pending publication.

It's been about 3 hours since I submitted, and research suggests that if it is the first time uploading, it will take longer, 3+ hours, no guarantee on length.

Some people seem to experience days of waiting.

Update 1

It's been 20 hours now, still in Pending Publication

Update 2

App has finally been approved after about 2days 18hours.

A further submission after that took less than an hour.