I just came back from Joshua trip, and I have nearly over 2000 photos to quickly sort through. In order to maximize speed up my workflow, this is what I did:
First, I shot both small JPEG, an extra small JPEG on my Ricoh GR 3X. I used the lightning to SD card adapter, and imported my photos into my iPhone Pro. Then, I look at the photos as aspect ratio, and favorite my best photos from the contact sheet screen.

The way I favorite my best photos is when I see them as small thumbnails, I click and hold the photos I like, and then I favorite them.

Also, a new hack I discovered is that when I like a certain photo and don’t want to lose it, I just screenshot it and crop it, and therefore it becomes their first photo in my photo stream, and I can quickly upload it to my WordPress media library.