Flying out of San Antonio

Like the title says my son is flying out of San Antonio Tuesday morning I believe at 5:30 AM. What is the TSA line looking like? What time should I drop him off at the airport because as it stands, we will be kicking around San Antonio Monday night and we don’t want to get a hotel so he’s thinking that I just drop him off at the airport about 10 o’clock and he can just hang out at his gate all night. He’s 21 so I’m not really too worried about him getting into shenanigans or being by himself.