Whipped cream is best and fluffiest right after you make it, but it can be made in advance if need be and leftovers can be saved for another time. The best way to store homemade whipped cream is to carefully spoon the mixture into an airtight container, preserving its fluffiness. You could also skip transferring the whipped cream and cover the mixing bowl with plastic wrap. Store covered in the refrigerator 3 to 4 days, unless the best-by date on the heavy whipping cream container comes first.