>Is there someone standing by at the dev/publisher to push a go button?
Quite literally, yes.
I imagine they can also be scheduled either directly on steam or with some custom script that essentially clicks the button when it is time, and presumably are most of the time, but there is literally a [release button](https://steamcdn-a.akamaihd.net/steamcommunity/public/images/steamworks_docs/english/ReleaseOptions_2.png) on steam.
https://partner.steamgames.com/doc/store/releasing#5
Other platforms may differ, of course.
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