On the day fixed for the sale or on some subsequent day to which the treasurer may have postponed it, of which postponement he or she must give notice at the time of making such postponement, and between the hours of ten o’clock a.m. and three o’clock p.m., the county treasurer making the sale must commence the same beginning at the head of the list and continuing alphabetically or in numerical order of the parcels, lots, and blocks until completed.