question about SSN and biometric

I have a question relates to the SSN and work permit

I know I-765 is for work permit document

if USCIS prove my I-765 document then does it mean

it comes with SSN, too??

I also have a question about biometric

I havnt recieved mail from USCIS for biometric schedule.

Is it possible to just walk-in to one of biometric office to do it before scheduled date?

You apply for a SSN using your work permit. You can only do a walk-in if you have your biometric testing receipt, it doesn't guarantee that they'll let you go through it though. It all depends on how swamped they are.

When your petition I-765 is approved you will received a EAD card, also call I-766 card. With that card you will go to your nearest Social Security Administration office and apply for your SScard.
On your second question, once you received your bio appointment letter, then you can try a walk in or wait for your scheduled date.

How long does it take to get SSN after applying for it?

years.... kidding

two weeks