According to the Pew Research Center, U.S. immigrants are as likely as the U.S.-born population to have a college degree, although the rate depends on their country of origin. The share of immigrants ages 25 and older with bachelor's degrees rose from 7% in 1980 to 17.2% in 2016, while the share with postgraduate degrees increased from 8.7% to 12.8% during that time.
Additional information can be obtained at http://www.pewresearch.org/fact-tank/2018/09/14/education-levels-of-u-s-immigrants-are-on-the-rise/.