Get Video Thumbnail dimention

[kucing]

hi, sorry for my bad English,
I like to cover all my video using FFmpeg,
this is the result :

[Attachment 67394 - Click to enlarge]
but I get difficulty when selecting which file is already covered and which file that not covered,
-the movies that are already covered have thumbnails taller than it wide
-the movies that are not covered have thumbnails wider than it tall
is there any ffprobe command to get thumbnail size or any other tool available on the internet?

Note: I looking for CLI, but if it is GUI I will use it too,

thank you for reading,
have a nice day