You should start from Chapter 42 of the original manga. After the destruction caused by Boros and his defeat by Saitama, the space ship is taken by Metal Knight. The Hero Association HQ is rebuilt.
Ch 85 of the manga. It just gets better, so you're in for a ride. Rate this episode here. Reminder: Please do not discuss plot points not yet seen or skipped in the show.
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It is also important to note that the manga starts deviating pretty heavily from the webcomic, though currently not in ways that fundamentally alters canon (though it's getting close).
If the anime would not skip on major events from the manga, “One Punch Man” season 3 is likely to begin based on chapter 85. This is where fans will find Garou waking up and finding out that he has been brought to the monsters' headquarters.
Yes, the manga series is still ongoing , though there have been months where it was on hiatus. The series pretty much is still released on several publications and republished in English for some countries.
One-Punch Man is a Japanese manga series written by One and illustrated by Yusuke Murata. One began publishing One-Punch Man as a webcomic in 2009. In April 2019, the webcomic resumed publication after a two-year hiatus.
Avatar. Tomohiro or ONE (born October 29, 1986) is the alias of a Japanese manga artist, best known for his manga series One-Punch Man (2009–present), which is remade by Yusuke Murata.
Garou's hero hunt begins: Webcomic Chapter 51. The noticeable differences arise around this time, as who Garou fights and when is different. The level of interaction between King and Saitama is also substantially altered, because Saitama is at the aforementioned tournament in the manga, while King is not.
But these 55 chapters are only barely more than half of the webcomic's current length, as the webcomic is at chapter 109 (by coincidence) as of the time of this post. The Garou/Monster Association arc lasts all the way up through Chapter 94 of the webcomic, making it longer than the entirety of the story up to Boros. Chapters 95 and on have so far not introduced a clear arc, but a lot of world building, character development, and character backgrounds have been provided.
Saitama vs. Meteor; Silver Fang, Metal Knight, Tank Top Black Hole introduced: Webcomic Chapters 20-23. Essentially identical between versions, with a few minor differences, mostly concerned with Genos having an upgrade available. Murata has fun in the manga again, basically animating (in color) Metal Knight's arrival. The anime again could have pretty much just scanned in that chapter and called it a scene.
Short answer: I would suggest you resume reading at Chapter 42 of the Webcomic, which is just after the conclusion of the Boros arc, because while the next several chapters will be familiar from the manga the deviations start to mount up pretty quickly.
Monster Association appears: Webcomic Chapter 55. Substantial differences between the manga and webcomic are present at this point, though the essential thrust seems so far to be the same. This is essentially where the manga is now (which is at chapter 109, by certain reckonings).
From this point on the manga starts to diverge fairly noticeably. For the most part this does not change anything in the canon, but as previously mentioned the manga gets this arc started with a martial arts tournament which does not exist in the webcomic. As such there are a lot of new characters and enemies in the manga, but so far none of them look to be important beyond setting things up (but we have to wait and see).
The final fight between Boros and Saitama is much longer in the manga/anime than in the webcomic. Saitama is not knocked to the moon in the webcomic at all. That's as far as the anime gets, but the manga is at the start of the Garou arc. From this point on the manga starts to diverge fairly noticeably. For the most part this does not change ...