OK, here's how I do it, see if it works for your truck.
Using the steering wheel buttons on the left side of the wheel, press the "down" arrow until your tire pressures are shown, then press the "right" arrow and scroll until you see the Oil Life, or whatever it is called.
You should see a percentage, and also the odometer mileage for your next oil change.
Note: In my case the oil life would direct me to get my oil changed between 8,000 miles and 10,000 miles. Most folks here are not happy waiting that long, most will suggest changing oil and filter at 5,000 miles
Let me know if this works for you or not.