How do I set "total ink coverage" to less than 280%?

Hello, I'm submitting a full page ad for print in a magazine and the specs list total ink coverage must not exceed 280%

I created the file in illustrator, it's mostly vector with 2 high res images. The color mode is set to CMYK. I tried looking this up online and all of the articles look really outdated.

They say to open in Acrobat and use "print production" i'm not sure if that function exists anymore. Is there a way to find out what percent I'm using in illustrator?

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