When you do your check in you will know what time you will checkin. Gold status doesn't mean anything for checkin or boarding at the port unless you're referring to a suite or Pinnacle when you say "gold", but even then, it's dependent on when you arrive. Once boarding starts, it usually doesn't make any difference. We always book 1230 for boarding day lunch, but we also always get an early boarding time. The one exception was a couple of weeks ago boarding Vision in Norfolk. We had a 1230 reservation at Chops but didn't get onboard until 130. Boarding that day didn't even start until 1 due to some issues getting everyone off due to tides. They took us right in.