how often do new updates come to brave as fast as chrome or later?
Well, when Chromium is updated, Brave it’s soon later but Brave-owned updates are coming often once monthly.
https://github.com/brave/brave-browser/wiki/Brave-Release-Schedule lists the scheduled release dates. My experience: it’s not unusual for actual releases to occur a few days after the scheduled date. As noted on the linked page, unscheduled releases are … unscheduled.