The rollout is already undergoing in the first wave countries, which are Bangladesh, Cambodia, India, Laos, Malaysia, Myanmar, Nepal, the Philippines, Sri Lanka, and Thailand.
In these places, 10% of the devices will get the update today, and 50% by September 5. The rollout will be complete by September 7. It will then hopefully make it to other territories.
As this was a Go edition phone from its launch, the software version it receives is that special iteration of Android 10, which comes with a smaller footprint and dedicated pre-installed Go edition apps, which take up less internal space and use less data than their normal counterparts.