You cannot tell for sure. But you can get CS maybe in round 2. Last year the cutoff was 384 or something. So you have a good chance of getting into BITS Pilani CS. But every other branch across all the BITS is available to you for sure. Congrats on the great score!!! May you get your desired branch.
Edit: I guess you may get BITS Pilani CS in Round 1 or atleast Round 2 with a good chance. The statistics show that scores have dipped. Hence, you can expect final cutoff to be just around 380.