Gmail App's Dark Mode Finally Completes Rollout on iPhone and iPad

After months of delay and inconsistent functionality, the rollout of Google's long-awaited dark mode for Gmail appears to have finally completed on iPhone and iPad.
Version 6.0.200519 of Gmail, which propagated through the App Store overnight, includes the following release notes:
Pro Tip (if you haven't noticed): You can now switch between dark or light theme after upgrading to iOS 13. Or you can use the system theme set by default.Google announced dark mode for its Gmail app back in September