Hello aspirant
Hope you are doing well
As you have mentioned that your percentile maybe 82 so your crl rank is accepted in the range of 18400-20700 according to the yead 2020 trends but it will mainly depend upon the level of question paper and number of students.  So it may go down or up according to the level of paper so your actual rank will be out only when the result will be out but it will range between the above numbers.
For futher you can use the rank predictor from the given link

For the previous year rank and  excepted 2021 rank you can use the given link
https://engineering.careers360.com/articles/jee-main-cutoff
Good luck
Hope it helps

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