Using the Shop button on the Elgato website then going to the Amazon link they have took me to the german version of Amazon; switching the extension to .com took me to this page which has an in stock date listed of June 11th, 2019.
Who knows how accurate that is though.
thanks for the heads up hopefully its there when I can attempt to get one later this week
https://www.amazon.com/Elgato-Stream-Deck-XL-customizable/dp/B07RL8H55Z