Giveaway question – how how long before the game should I be at the gate to ensure I get it?

It’s been a while since I’ve been to a giveaway game. I’m going to tomorrow’s game and plan to get the Orbit bobblehead, but I’m wondering if I have time to grab brunch in EaDo at 11 and then walk over. Would arriving to the gate at 12 be good enough to ensure I get the giveaway or should I be there earlier? Thanks!