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?

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Shingeki No Kyojin, chapter 87 - Attack On Titan Manga Online

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Attack on Titan' Episode 87: Release Date, Time, and Where to Watch

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Will there be an 'Attack on Titan' Season 4 Part 3? Season 5? An 'AoT' movie? Here's what you need to know