The travel bans necessitated by the COVID pandemic have created much flux and uncertainty. Synthesizing the information now finally available from various US government sources, it is clearer now that many intending travelers can seek and obtain an exemption from the ban under a series of provisions for a National Interest Exception (NIE).
You should be able to apply for an NIE to overcome the ban on travel to the USA if you meet any one or more of the following categories:
USCIS' Fraud Detection and National Security (FDNS) office has recently explained the three types of site visits that are currently being conducted:
1. Risk Assessment Program fraud study (RANDOM VISITS). This is a joint study by USCIS and ICE applicable to both family-based and employment-based cases. Cases are chosen for randomly for review and site visits usually after a case is approved. The purpose of this study is to build a profile of the types of cases where fraud is most prevalent.