Yes, LG G7 Plus does have an Always-On display.
LG G7 has a display resolution of 1440 x 3,120 resulting into 564 PPI.
Yes, LG G7 Plus does have the 3.5 mm headphone jack.
Yes, LG G7 Plus does have the portrait mode.
Yes, LG G7 Plus does have the Corning Gorilla Glass 5 protection, on both sides of the phone - front as well back.
The LG G7 ThinQ comes with some very appealing features that include a Super Bright Display, a dedicated Google Assistant button, DTS:X surround and an incredibly loud speaker. It also comes with a notch which may not appeal to everyone but its powerful specifications and strong feature set make it a worthy contender.