Show Last Updated on the node edit form

Thanks for asking about this. Can you provide more clarification on what context you're looking for. The statement below seems incomplete:

While editing a node, it would be great to see when it was last updated.

Normal node edits provide this information, as shown in the screenshot below:

In the context of Layout Builder, another common node editing paradigm, if this module's Last Updated date is set to be displayed, it will display from the Layout tab:

What context or scenario is this information not available?