Most DFW security lines are usually 5 minutes or less, maybe up to 10-15 or so during busier times like Monday mornings (occasionally longer on holiday weekends). Since you're not checking bags, if you're able to print your boarding pass at home, that early in the morning, you'll most likely get from curb to gate in 5-10 minutes total.

But it's always good to allow some extra just-in-case time.