“Released” packages are packages that have undergone testing with a specific version of Unity, and all other packages released for that version. The package also contains complete and accurate documentation, an updated changelog, and valid licensing.
Packages that have been verified to work with this version of Unity display the indicator in the details view or the indicator beside it in the list view on the Package Manager window. For more information about the lifecycle of packages, see Package states and lifecycle.
The packages that appear in this list are safe to use in production because Unity supports them by testing them thoroughly and providing bug fixes.