Thanks everyone. Some great advice. We updated all the metadata using the app. Still not sure how to save it to our existing files because Calibre uses different naming conventions. We've been using "Book Name - Author" like the below. All we want to do it save the new metadata back into these files. Maybe we need to change our approach.
I did try "Polish" - metadata, cover, and book jacket boxes checked. Worked pretty well. But this updates the Calibre "Library" folders and not the files in our original folders.