If you’re stuck continuing about what would happen when Daylight discovered that Vincent is an Alicorn, I think you don’t need her so soon to discover he also had wings. He can just wear his disguised suit like from the Galloping Gala and talk to each other like before. Then at the ending, Rarity had learned an important lesson about friendship.
I think the best timing for him to reveal his true self is during the Hearts and Hooves Day, which he will send a secret admire Valentine and the Cutie Mark Crusaders will also add him and Daylight together with Big Mac and Ms Cheerillie using the love potion. Then the ending, at night the Prince will then reveal his Alicorn self.
What do you think? You don’t have to use it if you already have your own idea.