How common are cheques/checks still in the USA?

All our banks (NZ) stopped issuing cheque books and accepting cheques over 2020 - 2021. There were some rather elderly people who were inconvenienced, but the banks were pretty good at helping them adjust.

And it has been a very long time since anyone really accepted payment in cheque form - just due to the crime associated - back in the days when new chequebooks were mailed out to customers, criminals would routinely check mailboxes for letters that felt like a chequebook.