Sound effect to confirm text is copied to clipboard
I only know of one Clipboard manager for macOS that has the ability to play a sound when you copy/paste:  Copy 'Em for Mac ($10USD).
To be candid, when I was evaluating clipboard management tools, I didn't see many with this feature because it seems like it would get annoying very quickly.  Besides my extensive use of the clipboard which required me to look for a management tool (I settled on FlyCut†), having a sound every time something was sent to my clipboard - normally selecting and copy/cut, using the CLI tool pbcopy or from my password management or text expansion/replacement tools - I would imagine that my computer would sound like a telegraph operator keying out some Morse code.  You might be better served with something that gives you visual feedback rather than audible.

† Flycut is an open source tool that is &quot;free&quot; though the developers do accept donations and I highly encourage folks to send them some compensation if you find their app/utility of use to you. I prefer to support this type development effort because their code is open for all to see.