Scones are best when baked the same day that will be eaten. If you plan to make them ahead, just freeze the unbaked scone disc you made above (I suggest cutting them into wedges before you freeze, but make sure to freeze them in a single layer). Store them wrapped in parchment paper and a freezer bag. Before baking, brush frozen scones with cream, sprinkle with sugar, and bake at 375 degrees for 25-27 minutes.