To query the metadata of the visible image at a certain scale in World Imagery basemap you need to use the Explore tool and click somewhere.
You get too many results in the pup-up window with the same name. When clicking on them, you can guess it returns the metadata of all imagery available at every scale at that point, but why? If I am just viewing only one of this layers?
In the video attached I am seeing the image of port of Beirut and click once on it, I get 17 results in the pop-up window ("Imágenes del mundo" = "Worl Imagery"), I know this is a sub-metric image but from the results obtained it is not sure if it is a World View-2 or WV-3. Also, the atribute table schema is not the same in all results.
The idea is to get only one result in the pop-up window or in case all results should be visible, to highlight more clearly which one is the one visible at that scale. And also to use the same attribute schema.