Dropbox mumbai embassy march end 2021 dates ** urgent **

Guys ,

Can someone tell me whether MUMBAI embassy DROPBOX slots are available in MARCH 2021 ? Can any one share thier experience such as
TOTAL days to drop passport and get the passport stamped ? If there is rush to book slots , Should one keep checking everyday for free slots ?

For h1b extension , i am DROPBOX eligible

I am waiting for renewal reciept number before i fill DS160 and check open slots myself .

I need to visit mumbai for personal reasons ASAP during March End for 2 weeks and return back to work in US

Thank you . it will be of gr8 help