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Had the same problem.
First, top off your coolant, as a matter of fact, top it way up and run the truck for a while at idle with the top off the degas bottle this should help purge any trapped air in the heater core.
If funds are tight, for now do a high idle mod, that will at least help you defrost first thing in the morning. You can do this for about five bucks.
If neither one of those help, then change the thermostat.
If none of those help take off the water pump and inspect it to make sure the shaft isn't stripped and the blades are good.
After that, you are going to want to pressure test to figure out if headstuds are next on the list.
For now focus on topping off coolant, doing high idle mod, and after all that, changing thermostat.