https://wccftech.com/battle-for-azeroth-patch-8-3-nyalotha/

Blizzard has announced that the first World of Warcraft: Battle for Azeroth patch 8.3 Ny’alotha raid test will be conducted later this week.

The first raid test for the upcoming Visions of N’Zoth content update will be conducted for those on the PTR this Friday at 13:00 GMT (22:00 CET). Players will be able to test the ‘Shad’har the Insatiable’ encounter in the new Ny’alotha raid by speaking to Nexus-Lord Donjon Rade III in Zuldazar, Boralus, Dalaran, Orgrimmar, or Stormwind to be teleported to the raid zone. Please note that the option to teleport into the raid zone is only available when the zone is actually open for testing.