Here's how 1440p support works on the Xbox One S and Xbox One X - Neowin
1440p support is coming to Xbox One X and Xbox One S soon - MSPoweruser
Xbox Series S: 1440p 120FPS, 512GB SSD, ray tracing, 4K video playback
Is 1440p Monitor Good For Xbox Series X? - InPics Solutions
Microsoft Xbox Series S All-Digital 512 GB Console White (Disc-Free Gaming), One Xbox Wireless Controller, 1440p Resolution, Up to 120FPS, Wi-Fi, w/a Wireless Controller and Controller Cover Skin - Walmart.com
Warhammer Vermintide Runs at Native 4K on Xbox One X; Developer Targeting 1440P on PS4 Pro : r/xboxone
Xbox One X and One S 1440p support coming very soon - Xbox - News - HEXUS.net
Microsoft Xbox Series S All-Digital 512 GB Console White (Disc-Free Gaming), One Xbox Wireless Controller, 1440p Resolution, Up to 120FPS. Bundle with GameFitz 10 in 1 Accessories Kit,and Game Pass. - Newegg.com
Xbox Series S – Microsoft Discusses Scaling Next-Gen Games to 1440p/60 FPS