Cuomo just said (without referring to it as such) that New York's R is 0.9, i.e. each new infected person is infecting 0.9 more people.
From eyeballing the recent data, I wonder if that's a hair too pessimistic. The deceleration across various metrics has been steeper over the past few days, maybe more in line with an 0.8 or 0.85. Italy claims to have a post-lockdown R of 0.8. 
Either way, that's not a ton of room to work with. It's good that R is meaningfully lower than 1, so cases are shrinking instead of growing, but it's unclear how much you can re-open while keeping it <=1.
