As noted by 9to5Mac, Find My Friends never showed up in iCloud’s beta website.
This is the latest service by Apple to find a home on iCloud, but far from the only one. Recently, it’s iWork products — Pages, Numbers and Keynote — shed the beta tags. The only service still in beta is News Publisher, which lets some users publish to Apple News.
If you were curious, Find My Friends for iCloud doesn’t add any features — it’s the same as the iPhone version.