First, the concept of peak is not so helpful. In nearly every country, there isn't a peak at the top. There's a plateau. The way up is steep. The way down takes time. It's more like a mountain range, or Table Mountain, than the Matterhorn.
Not only that but the shape of the top is the result of isolation. You can't remove the measures to stop the virus spreading without the strong likelihood that it will multiply anew.
So has the US reached a plateau? Possibly. But yesterday was a strong up day. And US figures are skewed by New York.
Are we going to see bigger numbers in many of the other 49 states, even if NY declines? For me, it's too early to say, and too risky to have a strong opinion. It's still crossed fingers time.
Should we expose countries to the virus because the numbers of cases may have reached the plateau? Of course not. You would be removing the thing that established the limit in the first place. So one might expect the contagion figures to accelerate if the economy is opened prematurely.