The Aggie Baseball X account has tweeted the exact time each day a few hours before. Should be a massive crowd for the championship games.
Also it's totally worth it to go especially if you have kids. Something special about hi fiving the players before they do their thing. And it truly seems like they appreciate the love.
Usually about 2.5 hours before the first pitch, but I would get there 3 hours before. The hotel bar is pretty good, and you could kill some time drinking a drink or two.