what will be my chances of getting cs in goodnight with jeemains 2020 jan percentile as 99.77112

It is difficult to predict the actual rank. But we can calculate your expected rank by this formula. Total 8,69,010 candidates appeared for the January Session. So rank formula is (100 - percentile score) X 869010 /100. That means, your expected rank would be 1988. If the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100.
Based on previous years' cutoff, you can expect CS in NIT Rourkela, Surathkal, Allahabad, Jaipur etc. You can also be admitted depending upon your home state quota.
http://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches
You can use our college predictor to know your admission possibilities-
http://engineering.careers360.com/jee-main-college-predictor

Hello!

The expected rank is 1,989. This is a very good rank. You can be admitted to top NITs depending upon your category and home state. The chances of getting CS is very high.

Check the following link for the recent NIT cutoff trends: https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

Hope it helps.