When filing I-601a when would it be best to submit the Affidavit of Support? That is the last thing on the list, but if it gets submitted does that mean the NVC will schedule a consular visit abroad in CDJ?

My cousin is applying for her husband. My cousin is a USC, and her husband EWI from Mexico.

She wants to make sure that an appointment won’t be scheduled in CDJ, that her I-601a waiver can be adjudicated in the US and that she’ll be able to submit her I-601a with no issues.

Thank you!!!