What to watch for before Noida Ext market corrects

Been tracking Noida Extension property for years, but my own investment is different. Prices, especially in Sectors 137 and 150, feel stretched. I'm holding a 2BHK, ₹78L near FNG. Jewar Airport progress toh hai, but should I hold for max gain, or is this the market peak? What specific signs are you watching for a correction? Builders like Godrej are active, but what's the real resale outlook for these projects?