(PC: Freepick.com)

From USCIS:

In 2021 the COVID-19 vaccine joined the existing shots required, such as polio, measles, and hepatitis B, as part of the medical screening for green card applicants. Proof of vaccination is no longer required effective immediately.

Source:

https://www.uscis.gov/newsroom/alerts/uscis-waives-covid-19-vaccination-requirement-for-adjustment-of-status-applicants