Newegg pre-orders are already sold out with a new expected ship date of May 27. Best Buy, however, is still in stock albeit at a higher starting price of $1200 USD.
https://www.notebookcheck.net/AMD-Ryzen-and-Nvidia-Max-Q-working-together-The-Asus-Zephyrus-GA502DU-is-now-shipping-for-1100.420138.0.html