I have the same question as the original poster. The responses above are helpful in providing alternatives to processing a large dataset all-at-once, but it would be great to have a way to know at what stage in the overall operation a tiled processing tool is working. I have a union working across several large vector data sets in a file geodatabase and similarly see the individual tile processing status bar going from 0 to 100%, but do not see a way to estimate time to completion. If this is not a current ArcGIS Pro capability it would be good to see this in a future version.
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