How many band corresponds to the beginning of the 4th season (NOT THE 4TH SEASON ON NETFLIX)?

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1

How many band corresponds to the beginning of the 4th season (NOT THE 4TH SEASON ON NETFLIX)?

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The last episode of season 3 adapts chapters 265, 266, 267, 268, 272 and 285. These are located in volumes 32, 33 and 35.
https://nanatsu-no-taizai.fandom.com/wiki/Wrath_of_The_Gods_Episode_24

Which chapter season 4 will start with exactly can't be said as long as the season has not yet aired.

If you want to read further, you should do so with Volume 33.