Of the 30 titles, 20 of them support Smart Delivery. You can take a look at the official list of titles below:

Day One Xbox Series X | Series S Optimized Titles

Assassin’s Creed Valhalla (Smart Delivery) Borderlands 3 (Smart Delivery) Bright Memory 1.0 Cuisine Royale (Smart Delivery) Dead by Daylight (Xbox Game Pass + Smart Delivery) Devil May Cry 5: Special Edition DIRT 5 (Smart Delivery) Enlisted Evergate The Falconeer (Smart Delivery) Fortnite Forza Horizon 4 (Xbox Game Pass + Smart Delivery) Gears 5 (Xbox Game Pass + Smart Delivery) Gears Tactics (Xbox Game Pass + Smart Delivery) Grounded (Xbox Game Pass + Smart Delivery) King Oddball (Smart Delivery) Maneater (Smart Delivery) Manifold Garden (Smart Delivery) NBA 2K21 Observer: System Redux  Ori and the Will of the Wisps (Xbox Game Pass + Smart Delivery) Planet Coaster (Smart Delivery) Sea of Thieves (Xbox Game Pass + Smart Delivery) Tetris Effect: Connected (Xbox Game Pass + Smart Delivery) The Touryst (Xbox Game Pass + Smart Delivery) War Thunder (Smart Delivery) Warhammer: Chaosbane Slayer Edition   Watch Dogs: Legion (Smart Delivery) WRC 9 FIA World Rally Championship (Smart Delivery) Yakuza: Like a Dragon (Smart Delivery) Yes, Your Grace (Smart Delivery)

In the same post, Microsoft mentions that Call of Duty: Black Ops Cold War will be coming on November 13 and the optimized version of Destiny 2: Beyond Light will be launching on December 8. You also get Xbox launch exclusive ‘The Medium’ on December 10 and the much-hyped Cyberpunk 2077 on November 19. So yeah, there is a boatload of games to look forward to with the launch of the next-gen Xbox console.