The April 22nd Presidential Proclamation on immigration goes into effect just before midnight tonight, but its effects are limited. The proclamation seems to serve political purposes rather than lay forth any kind of meaningful or sensible immigration rules.
It bans the entry of people who are seeking immigrant visas at consulates around the world. Immigrant visas are for those who are trying to come to the U.S. permanently and receive green cards upon their entry. It should be noted that consulates around the world have already suspended routine visa processing due to Covid-19, so this proclamation has no immediate impact.
Certain people are entirely exempted from the ban and they will not be impacted at all. Those people include spouses of U.S. citizens and minor children of U.S. citizens. Also, lawful permanent residents trying to return to the U.S. will not be impacted, and they will continue to be able to return and travel internationally.
Finally, those who are seeking adjustment of status before USCIS in the United States are not impacted at all. If you have a case pending with USCIS, you will NOT be banned from receiving a green card. And USCIS remains operational at this time even though they are not conducting interviews due to Covid-19.