Yea, except in the case for a tie (both teams pushing the cart to the end, regardless of time) it goes into sudden death. Sudden death has it so a random team is selected to attack. If that team captures the first point, they win the whole match, if not they lose. Or in short, if both teams "win" the map, the victor is decided by a coin toss.
They need to just implement stopwatch

Cool to see organizations preparing stuff so soon, though I don't really know how I feel about the time-based scoring system. I get that it's supposed to be used to differentiate good teams from mediocre teams, but all this does is punish more careful teams that use remaining time to their advantage. Also really disagree with the 1 hero / team limit for koth maps, I don't understand the reasoning for restricting it that much.