Sorry for the veer late reply, you might have found it already, but just in case someone else is wondering...
Your Ren'py save files on Mac can be found at this path: ~/Library/RenPy/
To access the above path:
- Open up a Finder window
- Press
COMMAND+SHIFT+G - Paste/enter the path (
~/Library/RenPy) into the text field and hitGo