Pending sales can be found under the Summary tab.
Pending sales are a Roblox effort to avoid the commercial scam and fraudulent purchase of user-created items involving Robux. It was officially released in September 2018 and can be found under the Summary tab.
When a user makes a purchase of an item, the seller must wait three days to receive the buyer's Robux. It was promoted as a security measure, and the three-day wait time follows that of game passes and other developer products.