New iPhone photos not showing up on new Photos app on iMac

In the past, when I took a photo on my iPhone, within moments it would show up on Aperture on my iMac in the iCloud tab. This is not happening on the new Photos app on my iMac using the latest OS.

In fact, there is not an "iCloud' stream area within the Photos app. Also, under iCloud system preferences, I have selected "iCloud Photo Library, My Photo Stream, and iCloud Photo Sharing."

Not sure what I'm doing wrong here.