https://arstechnica.com/gadgets/2021/04/new-ipad-pro-apple-tv-4k-and-24-inch-imac-now-available-for-order/

As previously announced, today is the day: orders are open on the Apple Store and through other retailers for the remaining hardware products that Apple announced on April 20: the 24-inch iMac and the new iPad Pro and Apple TV 4K.