“It is now time to see whether or not we are able to close an agreement,” Kerry said, after hobbling on crutches through 97-degree heat to a podium set up in a city square.While “genuine progress” had been made and the sides “have never been closer, at this point, this negotiation could go either way. If the hard choices get made in the next couple of days, and made quickly, we could get an agreement this week,” Kerry said.