Man, that's the eternal struggle with weekly manga, isn't it? Trying to find the official drop can be a pain, especially when the fan translations pop up instantly on aggregator sites. Legally, you've got a few routes. Viz Media's Shonen Jump app or their website is your best bet for the official English version. They usually drop the new chapters the same day as Japan, Sundays around like 1 PM ET.
Just download the app, you can read the latest few chapters for free. If you want the whole backlog, it's like two bucks a month, which is honestly a steal. I remember trying to hunt for a ‘free’ official spot for ages before just caving and getting the subscription. It’s so much cleaner, supports the creators, and you don’t have to deal with pop-up ads or weird formatting.
Some libraries also offer Viz's digital catalog through services like Shonen Jump’s library program, but that’s more for volume collections than the latest weekly chapter. Honestly, for sheer convenience and immediate access, the app is the way to go.