Hi Shaswin.

The official cutoff of JEE Mains 2020 will be released along with the final results after the April JEE Mains. The NTA will announce category wise cutoffs then. But you can still check your estimated rank using the formula (100-your total percentile)*869010/100. So with this percentile, your estimated All India rank will be around 1,57,290. Now, if the candidates appearing in April's JEE Mains increase, then your rank would increase too.

Yes you will qualify for JEE Advanced (and have passed JEE Mains), because the predicted cutoff is around 74.3166557 percentile for OBC-NCL. For checking out the probable colleges you might be able to get, check out this college predictor -

All the best.