They already have significantly more than they need. Americans already pay less as a percentage of their paychecks for food than any other nation on earth.
What they're running out of though, is fresh water. Having two extra Colorado rivers' worth would be pretty nice in the southwest! [1] And that's just from beef. Don't get me started on the gallon of water it takes to grow a single almond in the California desert while asking people to skip showers [2]. [edit] While the Utah governor literally prays for rain. [3]
[1] https://www.cbsnews.com/news/colorado-river-water-level-60-m...
[2] https://www.latimes.com/california/story/2022-05-29/californ...
[3] https://governor.utah.gov/2021/06/02/gov-cox-invites-utahns-...