Copy files after the current copy operation is completed
Pathfinder from Cocoatech
It's called Queue file operations or Copy queue:

Open in the menubar Windows -> File Operations (or shortcut: altcmdP) and enable Queue file operations. All file operations (like copy, move etc.) will be queued then.


CopyQueue from Curio Software

You have to define new tasks (New Queue or cmdN) first.
You may save them, if you have to use certain copy operations repeatedly.