You can view your the boarding numbers you received and print out your boarding passes any time after the 24-hour mark. However, there's no real reason to go out of your way to get the passes printed before you get to the airport as you will still have the numbers you originally were assigned no matter when you print.
If you are staying at a Disney resort and will be using RAC (available to SWA passengers everywhere except CBR and OKW at this time), they will print your passes at that time. If you have only carry-on bags or just want your passes printed in advance for some reason, the front desk at any Disney resort or the guest services locations in the parks or at DTD will print the passes for you. However, if you are checking bags at MCO there will be no time saved by getting your passes printed early and you will be able to get them at curbside check in, at a kiosk or wherever you check your bags at the airport.