I would be careful what your dealer tells you. A special order at this point seems to take 6-12 months and getting the options you want when changing a dealer allocated vehicle can take up to 6 months.
Average seems to be 2-4 months. It all depends on what your looking to add.
I had my dealer change an allocation to my wants: 16' TRD off road, inferno, long bed, double cab, premium & tech package, tow package, all weather floor mats, black rims, tonneau cover.
Toyota constantly refused to combo. I waited 4 months to get what I did and that's minus the black rims and tonneau.
Ask your dealer about a special order and an changing an allocation.
Good luck!
16' TRD Off Road DCLB Inferno