Changing the background colour of cells edited in the last 10 minutes

Hi,

I need to easily see the cells in a Numbers spreadsheet that I have updated in the last 10 minutes. I have put this applescript together with Chat GPT and some basic knowledge. I have triggered it in Automator and it runs and brings the correct spreadsheet to the front but the cells don't change colour. I am wondering if anyone is able to see what I am doing wrong?

After 10 minutes I need the cells to turn back to not having any background fill.

My Applescript skills are very basic and so I would appreciate any help?

on run {input, parameters}

tell application "Numbers"

activate

try

set theDocument to document "Placemats.numbers"

tell theDocument

set editedCells to {}

repeat with t in every table of every sheet

repeat with r in every row of t

repeat with c in every cell of r

if modification date of c is greater than ((current date) - (10 * minutes)) then

set end of editedCells to c

end if

end repeat

end repeat

end repeat

repeat with editedCell in editedCells

set background color of editedCell to {65535, 0, 0} -- Red color

end repeat

end tell

end try

end tell

return input

end run