When you order eyeglasses from Walmart the process of getting the eyeglasses from Walmart Vision Center takes from 3 to 7 days.
Usually you'll get the eyeglasses within 3 days but sometimes it can take as long as 7 days which is a week before your eyeglasses are ready for you.
If you haven't heard back from Walmart Vision Center within 7 days of ordering your eyeglasses then it would be best to call them or go see them about it.
Usually though most people get their prescription eyeglasses from Walmart within 7 days at most.