The EFF launched a new site you can use to see if your Chrome install is one that Google is testing FLoC on.

Google is running a Chrome “origin trial” to test out an experimental new tracking feature called Federated Learning of Cohorts (aka “FLoC”). According to Google, the trial currently affects 0.5% of users in selected regions, including Australia, Brazil, Canada, India, Indonesia, Japan, Mexico, New Zealand, the Philippines, and the United States.

They also do a nice job describing exactly what FLoC is and what it might mean regarding your privacy online.