The maintenance will affect both the mobile and Nintendo Switch versions of the app, and is set to take place from Thursday 22nd October at 23:00 UTC until Friday 23rd October at 04:00 UTC. A message within the app notes that "during this maintenance, all functions of Pokémon HOME will be unavailable."
Once the maintenance is complete, you'll need to update your mobile app to version 1.3.0 and your Switch app to Version 1.2.0.
While it hasn't been confirmed by The Pokémon Company or Nintendo, it's very likely that the Crown Tundra DLC will drop during the timeframe mentioned above. We expect you'll be able to enjoy the new content – and all of those guaranteed legendary Pokémon captures – once this maintenance is complete.
Looking forward to The Crown Tundra? Let us know if you'll be diving into it later this week with a comment below.