Only you can decide if your cider needs sweetening. Since you are kegging, I'd hold off for a couple months. You can always add lactose to sweeten, that won't ferment out. If you didn't add cane sugar to boost the ABV, there's a good chance the cider will not need to be sweeter.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk