The final walk-through normally takes place a day or two before closing / settlement. The purpose of this walk-through is to ensure that any repairs agreed upon in advance have been made, and that no other issues have arisen.
In most cases, the final walk-through is your first opportunity to see the house without furniture. Examine the walls and ceilings carefully. You have two objectives: First, you want to make sure nothing has changed since you last saw the house. Secondly, you want to inspect all repairs the seller agreed to do in response to the inspection.
Uncorrected items should be brought up prior to closing. It is the seller’s responsibility to fix them.