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I think you'd use Max ( OrderReceived ; ProductArrived ) to find the greater of the two values.
Just a note also that you posted your question in the FileMaker Developer Challenge 2016 forum, which was set up for a very particular discussion for an event that took place at FileMaker DevCon this past year. You'll get more views (and probably better responses) if you post in the main Discussion area.
All the best,