Yes, it means there is not a leap second at the end of the current day. (Seeing as today is 2 January, this is expected.)
That flag is separate from the
leapfile stuff, though; NTP can learn leap information from its upstream servers, and that will affect that flag. So, even if you were checking
ntpq -c rv on the day of a leap second, you wouldn’t know if it said
leap_add_sec because of a leap file or because it had learned it from other servers.