Hi, PictureMom - I'm a PC user, not a Mac user, but I'm completely sold on a program called Extract Now. All I do is drag-and-drop my ZIP files into the Extract Now window, and it unzips them all and, if it's successful, deletes the original ZIP file.
I looked for a Mac alternative to Extract Now, and came up with this web page:
https://alternativeto.net/software/e.../?platform=mac
Obviously, I can't speak to the efficacy of any of the programs on the list, but maybe it's a good place to start. Hope it's helpful!