My experience as below
Appointment Time: 31 march 2022 ( 12: 15 pm ) but went 11.45 am and they allowed and completed everything and came out at 12.15pm
you can take your bags and keep it on first floor ( security guards available so no need to panic)
Appointment Date : 31 march 2022
Case Created : 1 Apr 2022
Case received : 1 April 2022
Administrative Processing : 04 April 2022
Visa issues : 05 April 2022
Passport received in hand: 08 April 2022
Documents:
I797 old and new
Appointment confirmation letter
DS160 Confirmation
one Photo as per US standard
Employment verification letter + position confirmation letter
Note : My previous amendment and extension both was rejected and now everything went smooth…