On August 30, Dept. of State issued the following update on which immigrant categories are prioritized.

• Tier One: Immediate relative intercountry adoption visas, age-out cases (cases where the applicant will soon no longer qualify due to their age), certain Special Immigrant Visas (SQ and SI for Afghan and Iraqi nationals working with the U.S. government), and emergency cases as determined on a case-by-case basis.
  
  
• Tier Two:  Immediate relative visas; fiancé(e) visas; and returning resident visas
  
  
• Tier Three: Family preference immigrant visas and SE Special Immigrant Visas for certain employees of the U.S. government abroad
  
  
• Tier Four: All other immigrant visas, including employment preference and diversity visas