Hi yes, they answered my inquiry today.
They replied "Due to your petition type, you will not receive a request for fee payment or document submission."
I sent a follow up inquiry today asking for confirmation that I don't need to submit the DS-160. I find that confusing that they are saying we don't have to pay or submit anything else.
Also, I had flipped the Petioner and Principal Applicant names on the inquiry so they also clarified that for me:
"The Principal Applicant or Beneficiary is the person who intends to immigrate to the United States.
The Petitioner is the U.S. permanent resident or U.S. citizen who filed an immigrant visa petition for the principal applicant."