Hi Kyle. Hopefully, someone else will chime in with a better solution, but I will give you an idea of a way to do this. First, have a formula field in your table that is just NOW(). Then your automation will trigger on conditions where that field is on or after tomorrow (not sure that will work but worth a try) and the single select field = Tomorrow.
Then your action is just an update record where you set the single select to Today. The big question is whether the NOW() formula field will trigger the automation with the built in boolean date options available in the trigger.
Good luck. Let us know if it works. This is just a guess on my part.