July 29 Pokemon GO Raid Hour

For Pokemon Go Raid Hour today, we have Kyurem.

Kyurem Pokemon Go Snapshot (Augmented Reality)
Here is Kyurem peeking through our balcony door.

Raid Hour is 6:00 PM to 7:00 PM in your local time zone.

When will Kyurem leave Pokemon Go?

There's no date on their first announcement, so we don't know. 
First came Reshiram, then Zekrom—now, Kyurem is coming to Pokémon GO! Starting Tuesday, July 7, 2020, at 1:00 p.m. PDT (GMT −7), Kyurem, the Boundary Pokémon, will be waiting for you to challenge it in five-star raids. In addition, there will be Raid Hour events featuring Kyurem every Wednesday at 6:00 p.m. local time while it’s in five-star raids.

July 30 Update: Starting July 31 at 1:00 PM, Rayquaza will appear in 5-Star Raids. Will they be appearing at the same time? We'll wait and see.