If I make it there by 4:30, do I get kicked out right at five when they close? Or can I stay a little after that until I’m done?

I am not sure you need to give yourself at least 2+hours just so you can have time to feed all the animals and interact with them they will come up to your car and I'll you pet them feed them take pictures some will follow your car to get more food just a fun activity for the whole famiy

I'm not sure but maybe try calling & finding out for sure from a staff member, but even if they give you an extra 30 mins, in my opinion you won't get the full effect of the views and the animals due to it being so big and fun.