Sabres fan

My cruise leaves Port Canaveral on February 6, 2023. However I am flying in the day before. I am vaccinated and boosted. If I get my COVID test early on February 4 will I be okay? How strict is Carnival on the 48 hour window? Is it by the hour or by the day? For example if my test is 9 am on February 4 will that be within the window? Of course I understand that COVID testing requirement may be different by then, maybe even gone. Thanks for the help.