Is there a way to "show in finder" multiple images at a time instead of just one?

A small plugin that wrote Finder tags to file system metadata would be great. This would be Mac-only but would solve your problem easily.

Workaround with a temporary subfolder:

Given the fact all the photos are located in the same folder: Select these 100 out of 2000 photos in Lightroom library module, right-click on that folder in the left panel, pick "Create folder inside..." and check the "Include selected photos" box. You have now created a temporary subfolder that contains all the files you need. You can open the subfolder in Finder / File Explorer and work with these files. But don't cut them, delete them or rename them! When you're done, go back to the Lightroom library and drag&drop the 200 photos back into the original folder. Delete the now empty subfolder.

In case anybody is wondering about the use case:

You want to copy the best shots from your vacation from your personal Lightroom catalog to your business catalog (both with different folder structure or stored on different hard drives).

I hope this helps those who have the same problem 🙂

What are you trying to accomplish? f you want to send somebody for example your 100 favorite originals from a folder or back thhose up to somewhere else, you might be better off selecting all you want in Lightroom Classic and doing an export as originals to a desired destination folder.

TBMK No.  If the files in Lightroom are located in various disk Folders- How would you expect Finder to display the files from differing folders?

You can select a Folder in the LrC Folder panel and [Show in Finder].