If the chapters are coming out weekly they should have enough material for a new volume before too long but how long does it typically take to actually be published?

Chainsaw Man Vol. 12 Cover Reveal! : r/ChainsawMan - Reddit Chainsaw Man Vol. 12 Cover Reveal! : r/ChainsawMan - Reddit

And for big Shonen jump manga like this, do they do a simultaneous release of Japanese and English volumes, or will I have to wait even longer?

Denji was a small-time devil hunter just trying to survive in a harsh world. After being killed on a job, he is revived by his pet devil Pochita and becomes something new and dangerous—Chainsaw Man! I ask because I'd like to read them all physically if possible. I really hate reading manga online especially if it's a fan translation, plus I like supporting the authors. Hi, pretty new to manga so don't really have a good idea of 'this chapter just released in japan, so it will probably end up published in a volume in x amount of time'.