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All other things being equal you should be able to inventory the top level WSUS server to get the information. It should only take a few hours (at most) to test this for your environment, and most of that will happen in the background when you set up and run the inventory.
There are a lot of moving parts on the WSUS side that can cause issues, a few that come to mind: I have seen issues with synchronizing this information if the downstream and upstream server versions don't match (2008 vs 2012 for example). Any synchronization issues between WSUS servers will mean you won't get that data, etc.
Thanks. Been testing today and find the reports cleaner with simply using the upstream WSUS server as the point of inventory and allowing the downstreams to roll-up natively.