Assuming you're not doing it yourself, you're looking at about 4-8hrs labor to remove the manual box, another 4-8 hours labor to put the auto in, you'll have to remove the clutch and put in a torque converter as well so lets go 8 hrs each way (approx $1200-$1600 labor), you'll need a new auto gearbox plus ecu, say $5k? perhaps? There will be some wiring changes to make, say 4-8 hours including researching what those changes will need to be (and that might be conservative). There's another $500-$1k plus. Also interior work to remove the manual centre console and put in the auto centre console - might be another $1k depending on what it will cost to purchase the console (it's still a pretty new car after all).
Some pretty scratchy figures there, but it wouldn't take much to get it to $5k or more. I know a bloke who had to replace the auto in his F250 - just out of warranty, and it cost him $11k just for the box alone. As Aido said, you wouldn't want to put an older auto in a ute that new.
Trading in would be a cheaper option.