Quick way to to identify image sizes in CMS

Some some of my collection items have been loaded with huge images - webflow reduces them a bit but even so when they go into thumbnail size catalogue displays I get load speed issues and am being marked down by google. So I want to swap them for smaller images.

Is there any quick way to identify exactly which collection items have the large images? This info does not show up on export so far as I can tell. There are 800+ items in the collection so looking at them one by one will take ages.

Thanks for helping.