Let’s be reasonable, you don’t release a game during summer vacations. That means not for another week or so at least, and with Bögenhafen as a measurement stick it is reasonable to assume late August.
Also, inspecting the steam package gives us 31th of August. See https://steamdb.info/app/1033060/info/ and
Store Release Date August 31, 2019 (26 days from now)
Although I do not know if the last of August is specified by Fatshark, or implied by steamdb.
Anyhow, Fatshark can change the release date whenever they want to.