I'm not sure if I'm going to take the time off yet but if I do what I'll do is try and distract myself for the day while waiting for the PS5 to arrive. I'll also make sure to take the stack of games I want to install and put them (and a blanket) into the room where it will go. Once it arrives (really hoping it'll be early in the morning) I'll bring it upstairs to the main TV (and it's home), unbox it, and set it up. Sign in and get my account on there, then start downloading the digital games, while exploring the UI. Then chances are I'll curl up on the couch (with the blanket) and start a digital game while I keep installing physical games.
If I'm working that day it'll be the same thing but I'll most likely plug it in, set it up, and leave it in rest mode downloading the games while I'm at work.
Either way, the first game I play is going to be Mafia Definitive Edition. I'm not going to do anything for snacks though except maybe a bottle of water. I don't want to risk damaging the controller. The good thing at least is i have Thanksgiving week off, so I'll be able to really dive into the system then.