We decided we had time to hike the 1-mile-each-way Condor Gulch trail to the Overlook, and made it there in about a half hour (Glen could have gotten there sooner, but I'm not a fast climber).
Once there we ran into others from whom we learned the critical info that condor wing undersides have whitish areas toward the forward part of their wings, vs. the multitudinous turkey vultures who have whitish feather underparts but black forewings. And we saw two
California condors circling the highest peaks now and then, among the many vultures! Made the hike that much more worthwhile.
Because it had been such a busy day despite not being a weekend, they were running a shuttle back to the visitors center, which stopped to drop us off at the parking lot where we ended up, saving us another mile or so hike. I can't imagine where everyone would park on a weekend, or how quickly the lots would fill.