Ashish, the official result of JEE Mains has already been released by NTA on their official website. You can check your exact percentile by going on the given link: http://ntaresults.nic.in/resultservices/JEEMain-January-2020-auth

You can calculate your approximate rank for JEE Mains using your percentile through the following formula:

(100-your total percentile) x 869010/100

Also, if the number of students increases to 12 lakh in the April session, the formula for rank calculation would change to:

(100-your total percentile) x 1200000/100

While it is difficult to predict the exact qualifying cutoff, a percentile of 85 or above is decent enough to qualify for JEE Advanced for the unreserved students. In 2019, the NTA score cutoff for the Common Rank List was 89.7548849

You can also go through our college predictor to check which colleges you are eligible for through your JEE Mains score. The link for the college predictor is:

All the best.