I usually go on the Fridays that I have off and some Saturdays. When I go on Fridays, you can get there as late as a little after 11 am and still have lots of benches. A few times I've been there where there were a couple of benches that were open just before noon.
When I go on Saturdays, I try to get there around 6-6:30 am to be sure that I get a bench in the area that I prefer. If not, I think getting there around 7 ish would be fine. I've also gone to shoot pistol first and there are usually plenty of benches around 1 pm. So depends on what you want/need to do, that is an option and usually fine for me.
What gets me is the disrepair of the facility. Like the section of roof that is missing and even closed down the range last fall. There are so many people volunteering to fix up the place, but due to liability and union work BS, nothing gets done. Still, it's one of the few, or for some the only, shooting facility available. I'm hoping things get better, but I'm not holding my breath.