This addon uses blizzards built in quest flags specifically for the various chests in the Timeless Isle and creates a button to work with TomTom to put waypoints to each of the missing chests.
NOTE: some chests may still be missing even if you have the achievement [Treasure, Treasure Everywhere].
NOTE: some chests (specifically the carry birds) are on top of the giant hills that are almost impossible to get on.
How To Use: type "/cstt" (c,s are my Identifying addon letters and t,t is track timeless) to show the button for "FIND CHESTS"; then each waypoint requires one click, after the waypoints are all on your minimap, the button will have two more click features. "/cway" which will make TomTom show you the closest one, and "hide" so the button goes away.
To Be Done: some of the chest locations are a close approximate, i will update with version 1.0 when all of them are exact.