Most likely there's a stereo click, one channel for the drummer, the other for the rest of band. The band's channel is just the count-off, maybe continuing as long as needed for a vocal or guitar intro, then muted. The drummer's channel may or may not continue for the rest of the song.I've noticed of the last 4-5 years more and more bands don't count in songs anymore. They just miraculously all start together in perfect tempo. This means the entire band is getting a click in their in-ears. Now if it's only the count in or the whole song, I don't know.
Assuming everyone is in-ear, the monitor person may also mute the click/count-off to the band's ears after the song starts.
But it's unlikely that everyone has the click for the entire song, and sounds good doing so. 😮