I got 99.938 percentile , will i be im top 500 AIR

First of all a very big congratulations from us.Your hard work has paid off. Since the rank has not been published by NTA so we can give you some estimation. There are more details we need to calculate the rank. But you have not provided us with the same.Here I am giving you the link for rank prediction, you can use it to know your rank

https://engineering.careers360.com/jee-main-rank-predictor

Hello Shreyas

First of all congratulations for scoring such a good percentile.It's a very good score and will definitely be in top 600 if not 500.Prepare nicely for the april session and advance ,you can easily make yourself in top 100-200.You can calculate your rank by rank=(100-percentile)*874469/100.But remember this rank is not final and will change after the april session.Hope this helps.

Good Luck!