We were DQ'd in September after FIFA ended -- it only took about a month for us to receive our IL, and the interview was scheduled for a month later. They definitely don't have a FIFA backlog anymore, but the holidays may get in the way.
@Kiwi_Bdan Did you give your mailing address to border control for the green card and SSN when you arrived? I (petitioner) moved between my husband's DS 260 submission and his interview. I updated everything I could (sponsor form, USCIS change of address, etc.) and let the consulate know, but I'm nervous that my husband's green card and social security card will be mailed to the old address.