Future traders commonly watch both the globex VWAP (all time) and the US session VWAP (9:30am to 4:00pm). Trading view's built-in VWAP indicator plots the globex VWAP. The USA VWAP indicator overlays the US session VWAP (using hlc3) onto any futures asset. It works for stocks too, but it would be the exact same thing as using the builtin VWAP indicator.