Opening will 40-45% and verdict will be Very good or excellent as per boi looking at their defensive commentary they did today to explain zero's advance booking.
You can't expect a Event movie like zero on Christmas competing with Raees and Tubelight.
Let alone me I don't think even srk fan expected below 20cr advance booking, it's looking like a huge task now and let me tell you Christmas is most suitable for these kinds of cinema, don't give action genre excuse because action was never srk's genre 2nd Salman did it with Prdp and Aamir did it with dangal.