TSA/security at MEM

I’m flying out of Memphis early Saturday morning (around 6). With everything going on (gov shutdown), what time should I arrive to the airport? I don’t fly often, although every time I’ve flown out of MEM I haven’t had issues and I’ve flown later in the day, so I’m not sure what it’s like in the early morning in a normal scenario. I am hoping to get there around 4 at the latest.