The Met's website discusses America Today here, and here is a link to their publication dealing with the mural: very useful. I discussed Benton's early career here.
The mural was commissioned for the board room of The New School for Social Research's 1931 building designed by Joseph Urban. It was later purchased by Equitable, an insurance company in New York and displayed in linear fashion along a hallway. Then it was donated to the Met which restored it (with some difficulty: read the publication noted above) and displayed in a setting corresponding to the space of the New School boardroom where it initially appeared.
Below are a few photos I took, giving you an impression of how the mural is displayed at the Met. Not all panels are shown -- you can find plenty of images on the Internet. My purpose here is to remind you that the mural is there to be enjoyed when vising New York and the Met.