Next, NVC ships the file to adjudicating embassy. With the CEAC #, the beneficiary can contact the embassy and inquire if you can start gathering the supporting documents such as police certificate, medical exam (provided you can take a copy of the welcome letter), fill out DS-160 etc... My case will also be processed at the US embassy in Mumbai, and I am still waiting for CEAC # (NOA2 Dec 6, 2022). Please share if you are able to get more information from the embassy.