Correct. As long as the balance in traditional IRAs at year-end is zero (and you had no outstanding rollovers that were completed early the following year that would need to be added back to your year-end balance), all of your basis in nondeductible traditional IRA contributions will be applied to your Roth conversions. You'll still have Form 8606 showing the calculation since Form 8606 is where you indicate that your year-end balance in traditional IRAs was zero.
