https://www.polygon.com/2018/7/5/17538514/destiny-2-prestige-raid-lair-start-time-world-first-race-loadout

Destiny 2’s Prestige raid lairs are finally coming in patch version 1.2.3 on July 17. But due to popular community demand, the average player will have to wait just a bit longer to interact with this new difficulty level. In This Week at Bungie on Thursday — the weekly news dump from Destiny’s developer — raid lead Joe Blackburn dropped some details on the new world-first race.

Originally, the Prestige versions of both raid lairs were set to debut at the same time. That’s no longer the case. In order to keep competition fair, Eater of Worlds — the raid lair from Curse of Osiris — will launch at 11 a.m. PDT on July 17, one hour after the patch goes live. Spire of Stars — the raid lair from Warmind — will launch a day later, at 10 a.m. PDT on July 18.