In accounting terms if you agree to a purchase today, it's logged against today, even if it's paid for next week / month / year. (educationbusinessuk.net)
The payments toward the CD is reported to all 3 major credit bureaus and at the end of account term you've built credit history and your CD savings unlocks. (rebuildcreditscores.com)
Lenders use the updated information to change limits and other account terms. (growingfamilybenefits.com)