Rootless Pixel launcher is the port of pixel launcher from pixel devices. This app wasn’t available on Playstore till now because of copyright issue. But now Amir Zaidi uploaded this launcher on the play store so a user can download directly from there.
Rootless Pixel Launcher 3.8 is still based on Android Oreo, with a future release possibly planned with the release of Android 9.1. Although, there is not a lot of features in Android Pie launcher which makes different at all.
Once you Install the application, It will ask you to Install Pixel Bridge so that you can use it on your device. Once you download that, just install it and set the program as default.