Just returned from Orient Beach. For checking in, per CDC guidance, you must provide contact information to the airlines before checking in/boarding a return flight. You no longer need a COVID test. Depending on how frequent you travel (and how your profile is completed with your airline), at most right now you'll need to confirm/fill out your passport info, fill out the contact information, and then you should be good to check in. Completing this in advance will allow you to check in online, otherwise you'll need to do it at the airport. I completed this in advance, checked in online, and went straight through security skipping the check in counter.

You don't need to use Verifly for the return. I used it for the trip out so I could check in online - I much prefer my mobile boarding pass and then just head right to the gate - assuming you aren't checking bags