Scheduling a Uber or Lyft

I live 42 minutes from the Tampa Airport and need a ride from a UBERXL OR LYFTXL early before my flight. I want to schedule a ride for tomorrow morning two hours before boarding but I am not sure that this guarantees a ride from Uber or lyft. I was on this morning just to see if cars were available and nothing. It’s currently 11 am and still no cars are available on uber so I have no idea what to do.