how to show total files size in a folder by filtering extension without showing each file size

 du -ch *zip | grep total

Just add a grep statement in the end.

If you are against grep, you can use,

du -s *zip
-s, --summarize
display only a total for each argument

you can use du -ch *.zip | tail -1 . last line of du -ch is total. If the files have total.zip grep total will return that one as well.