Needs to be supported per the code. Looks pretty well supported to me considering the length. Question is would any inspector ever see it? Doubtful. Could just tap in a 1/4 hole
below the pipe and standoff a mineral clamp. Piece of box tubing as suggested. If I was doing the job myself I would add some kind of support. If someone else did it then I would
turn a blind eye on that one. Have seen a lot worse.