Google+ for G Suite APK is a free app listed in Social Apps. Download this apk on your android phone to install this app
Google+ is now only available for G Suite customers, and it is no longer available for consumer (personal) and brand accounts. Learn More: https://support.google.com/plus/answer/9217723
G Suite customers may see some changes to Google+ features related to the consumer Google+ shutdown. You can talk to your G Suite administrator to learn more (https://support.google.com/a/answer/6208960), or you can find more details here: https://support.google.com/a/answer/9229693.
You can also expect a new look and new features soon. Learn more: https://cloud.google.com/blog/products/g-suite/new-enterprise-grade-features-in-googleplus-help-businesses-drive-collaboration