I was out around the same time yesterday. From the satellite view, there were only 9 in sight and three of those were right on the horizon, so they were useless. By 4:00, there were 11 and I was holding a much better signal.
It still beats the time I tried to get a cache in before work. Drove out to the site and couldn’t figure out why I couldn’t get a signal, even in open air. There were only 6 birds showing up, and three of those were on the horizon, so I was getting nothing. Headed back to the car and left.