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I thought the efficiency of a Dyson sphere/swarm was typically measured by how much of the star's total power was being used?

We are not capturing 10-15% of the sun's total power output.

Well, by that metric we have 0.0000000001% of a Dyson sphere created.

Pretty sure solar panels are 20% plus now with some much higher.

Just did a Google search. Most cells which are actually produced are 10-11%.

Most residential deployments are near 20% or higher.

Good call, doing the search with those keywords yielded similar results

That will be average efficiency, because during night solar panels usually don't work, unless you live in Spain https://www.nationalreview.com/planet-gore/scandal-solar-pow...

Don't forget the farms that feed humans and their farm animals.

Well, the entire ecosystem and weather is fed by solar. It would be interesting to think about what it's "efficiency" would be...