While this sounds like a good idea in theory, growth and conditions can vary considerably, even within the same orchard. My friend nearby has a Kesar tree, as do I. While there was overlap, we were largely harvesting at different times. He had mangoes a month later than our tree did.
I would only use Zill picking times as an indicator that they are picking a variety at that time. Might check a bit more closely for signs of ripeness on my own trees, based upon reports from others.
Gotta get to know all your varieties. Its not easy with all of them, but part of the fun. Almost got Sweet Tart figured out.