How many Attack on Titan manga chapters have been adapted by ep 87?

How many Attack on Titan manga chapters are left to be adapted in season 4 and will they all be covered in the now-delayed episode 87?

How many Attack on Titan manga chapters have been adapted by ep 87?

Simulation of the area covered in the last chapters / episodes : r/ShingekiNoKyojin

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which manga chapter do i start reading from after finishing episode 87? : r/ShingekiNoKyojin

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