If I'm not there 20 mins before what happens? I'll be there 10 mins before the bus departs my uber was stuck in traffic

Hussle once you arrive, but chances are the bus has arrived late and will depart late.

You're good. Just get there BEFORE bus leaves

You should be ok,long as you get there before it pulls off.

You will be fine the bus are ususlly there up to the time so once the time hasn't pass you will be able to board

More than likely it's a Greyhound bus it'll going to be late, if it shows up at all. You should be fine. You can always download the Greyhound app. It will tell you what it's going to be on time or not

You'll be fine i got on at 5 minutes before departure

You should be fine. They still let people board right up till departure time.