Cover Dimensions Info

Hey guys:

Here is what I want to do: I want to have all my files with cover dimensions 500px x 500px.
Since MP3tag can't resize by itself covers, I have to export them resize and import them back.

But in Cover Column I can't find out how to show the cover dimensions, so I can know what covers I have to export for resize. I just want to see in cover column the dimensions of the cover(s) in pixels.
How can I do that?

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