It looks like a couple of the valleys are elongated a bit, so there is some wear. The greatest wear is usually at 90 degrees off from where the crank arms are.

But, I typically just go by actual symptoms.

Dropping the chain when not expecting it?
Noise?
Something else?

If it was me, I'd put the rings back on. If you can ride it just fine, keep riding. I suppose it might be a bit different if you're racing, but still, no need to preemptively replace when asymptomatic.