How to update custom fields when post is published?

Seems like you need to change your action to publish_post.

publish_post only fires when a post is published.
The callback function will only receive only one argument, the post id, with it you can do all your needed checks and update the meta as needed.

By the way, update post meta doesn’t play well with ACF in the initial update. If meta field was empty it will sometimes not update it.

Acf has its own function to deal with meta updates update_field, better use it instead.

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