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It will go overripe quickly if allowed to start to turn soft on the tree. Harvest it green/firm when the color turns to a lighter shade.
They fall off on their own usually, so I would Bag them if possible and check the bags daily
I ran across this video which explains general detection of ripening. The idea of different color ribbons installed during bloom is interesting. https://www.youtube.com/watch?v=I4qSHrepLL8&t