Sure. Take the ring off the piston and examine the wear surface in a scanning electron microscope. You should see a uniform surface topography.

Alternatively, you could use a leakdown tester. Compare the amount of leakdown from the fresh bore to X hours later after running. When the leakdown tests quit improving, it's broken in.

Unfortunately, they don't make engines like Butterball turkeys....no little doohickey pops up to tell you the thing's ready.