I can't answer your initial question on specifically when it's updated... but within the console, I strictly look at this to get an idea of what my data operations are right now or if I made progress against it in the last hour when making changes. Although it might not match data operations exactly, my understanding is data operations would be roughly the sum of "Integration traffic" + "Cloud Function Calls" + "Cloud Variable Requests". I think event traffic is roughly the sum of the 3. You can filter this by each device group or device firmware so fairly easy to pin point where it's coming from and if/when a change you made is making progress against reducing data operations for say a development device. You may need to add the device to a group first but I think that would work well.
That was my approach at least when I was attempting to reduce my own data operations: