This is a MUST DO in my opinion. There is just no reason not to, especially considering how much positive impact it can have.
Google and Apple jointly created the Exposure Notifications System out of a shared sense of responsibility to help governments and our global community fight this pandemic through contact tracing while protecting your privacy.
On Android, you can find the app for your area, if available, on Google Play.
If you have an iPhone, opt-in to Exposure Notifications in your device settings.
More info: https://www.google.com/covid19/exposurenotifications/