Here is the AccuWeather radar at 6:42pm. Blues = snow with darker blue indicating heavier snow.
Here is an updated computer model snowfall forecast
A blizzard warning is in effect for the eastern shore of Massachusetts, including greater Boston. The pinkish gray inside the red are forecast snow accumulations of more than 20 inches.
Again with this forecast, NYC is on the edge of the heaviest snow. A shift of just 20 miles will make a major difference as to the ultimate accumulation.