Result for JEE main is already declared and you can check you are result by visiting the link given below.

https://jeemain.nic.in/jeemainresult/ViewResult.htm

once you know the percentile score you can calculate your expected rank based on the following formula

(100-percentile score)*869010/100

if the number of students in JEE main April get into 10 to 12 lacs in the formula for calculation of rank would be

(100-percentile score)*1200000/100