How to print full presenter notes without slides in Keynote
This applescript should do it for you:
global presenterNotes
tell application "Keynote"
activate
open (choose file)
tell front document
set presenterNotes to presenter notes of every slide as text
set the clipboard to presenterNotes
do shell script "pbpaste > ~/keynote-notes.txt"
end tell
quit application "Keynote"
end tell