If you can find the vessel owner you can check their site for schedule. Yeah it's meant to dock in Papeete on 11th Aug. As you said currently in the middle of no where so can't track.
Checked on Monday this week and there was no update but just got advised my stang is assigned to vessel TAMESIS. They weren't able to tell me when it would be departing though.
Marinetracking suggests it left Baltimore 23 Jul and on its way to Savannah. What's the chances my stang is on there?
Do you know if your MY19 has been built yet?
Mine is on the way to Baltimore docks and am surprised that ETA is end of Oct, would have though end of Sep is more like it.