I assume just on the Single Post ?
If so go to Appearance > Elements ( or when viewing a post via the Admin Bar > Elements menu ) and edit the Single Post Hero.
Here you will see the block built hero element, that includes the Headline block that has its dynamic data set to display: Post Date -> Published Date.
Duplicate the Block, and change the new one to show Updated date.
You can make more duplicates of those blocks, and remove the dynamic data, and use them to show some static text, such as Published on: