The mode uses the Amped Hardpoint Gamestate HUD (the top central elements), almost all of the info about the match status can be read from there.

The Score Bars actually don't track the team scores, instead they track the shields of the key entities, the Harvester and the Nuke Titan respectively. If you are in the defending team, the friendly bar is the Harvester and enemy is the Nuke's shields, vice-versa for the pushing team.

Sometimes it's possible to see arrows pointing to the left inside those score bars, those arrows are the amount of players within the perimeter of the Nuke Titan, the more arrows the more players (caps at 4), that is to track at which speed the Nuke Titan is moving.