Hello, dear

 well they didn't officially released the cut-off of this year ,after offcial you will be able see on their website , 

i will show you last year cut-off of particular branch.

FOR  CSE

GENERAL- openinig and closing rank= 1-59

OBC-NCL= OPENING AND CLOSING RANK= 9-37

SC=    OOPENING AND CLOSING RANK= 1-14

ST=    OPENING AND CLOSING RANK = 1-9

if you want to know last year cut-off of all branch of IIT-bombay ,please visit the below link

https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay

hope this will help you