Where can I find Photoshop icons in svg format?

If you are talking about tool icons, then I am not sure.  I've searched for some of them over the years to use in these forum threads, and ended up making my own, but other than the Pen Tool graphic and the other two icons, I don't seem to have saved them.  (I usually make things like this into Smart Objects, and drag to the Library panel).  There will be others hidden among the hundreds of posts I've made here, but good luck finding them.

If you do find a source of these tool icons as vector objects, then I'd appreciate a heads up.

https://www.vecteezy.com/vector-art/63408-free-photoshop-tools-icons