To get a visual representation on the cache status, you can copy the Status.gdb to your desktop (or a location not in the arcgisserver folder. Once it's copied to a new location, you can add the feature classes within it to ArcMap. I believe you want the TaskStatus feature class. There is a lot of information in the attribute table that you can filter on. You can see the bundles that have been completed or had errors, see the time of completion for that bundle, and the scale. If you sort on time, you can see which bundles were created last and determine an approximate status.