Upon game load, there are a bunch of GraphUpdateObjects which trigger to update the grid graph to apply proper tagging, penalties, etc. to account for doors, walls, etc.
I need a way to know when those updates are done, so I can then begin the game. Currently they seem to be async and I can’t find a way to essentially wait until they’re all applied and completed.
Thank you
You may want to check out AstarPath.isScanning 
Seems like exactly what you’re looking for.
Just for knowledge’s sake, there’s also IsAnyGraphUpdateInProgress, IsAnyGraphUpdateQueued, and IsAnyWorkItemInProgress also a part of AstarPath! These are for graph updates rather than graph scans though.
You can also force them to complete immediately using:
AstarPath.active.FlushGraphUpdates();