Memphis is the main FedEx hub so delays there are super common, and the good news is most shipments still arrive alive even at 48 hours if the vendor packed well (heat or cool pack depending on season, oxygen in the bag, insulated box).
A few things that actually matter once it gets there:
1. Skip the long drip acclimation if it's been 48+ hours. Ammonia builds up in the bag but stays trapped in toxic form because shipping water acidifies (low pH = NH4+, less harmful). The second you start dripping fresh tank water in, you raise the pH and convert it to NH3 which is what actually kills the fish. For delayed shipments, do a quick temperature float (15 min), then net the fish straight into clean QT water. Dump the bag water.
2. Take photos and a quick video the moment the box opens, before you do anything else. Most vendors require this for DOA claims and the timestamp matters.
3. File a FedEx GSR (money back guarantee) claim within 15 days if it was a guaranteed service. They'll refund the shipping cost which the vendor can credit back to you. A lot of people don't know this exists.
4. Hardier stuff (most snails, shrimp, hardy fish like clowns and damsels) handles 48 hours much better than sensitive species (anthias, wrasses, anything from deep water).
Reef Beauties has a decent rep so they probably packed it well. Fingers crossed for you!