If he is eating well and acting normal, and perching I'd try to keep him calm, quiet and I imagine he will be fine.. he does really look okay. This next part is VERY unlikely, but good info to have as a parrot owner (just in case this ever causes an issue etc)
AGAIN, this next part is JUST IN CASE-- your guy would very much likely be worse off if things were going to progress, so just keep this in your back-pocket:
If you see any seriously questionable behavior, do take him in to a vet ASAP, but it happens (and I REALLY doubt that is the case here)...The risk is, when they hit hard enough, it can cause spinal compressions or brain swelling or serious shock (which, while shock alone is not deadly, it can be, if they don't have the proper supports-- usually a shocked bird seems dull/out of it in comparison to their normal selves btw)- AGAIN-- THIS IS MORE OF AN FYI--I think your bird seems fine, based on what you have said..In a serious "shock" scenario (where a bird seems dazed or passed out, or uncoordinated) you would want to keep them much warmer than usual, in a darker space and quiet/without stimulation (as a rule).
In the worst-case-scenario, you would likely see a bird that appeared to stumble or seem disoriented for longer periods-- I can't say for sure, but your is probably okay..Your bird genuinely seems like a toddler who fell down and bumped his/her head (typical)
BUT, in the event that things get weird, keep him as calm/quiet/ in a dim space much as possible and place him in a paper towel roll do-nut to keep him from rolling onto his back or side if he appears to be unconscious and keep things much warmer than normal. I would never recommend dim spaces for a parrot unless it was in genuine shock...Nor would I place one in a small, paper towel do-nut-- that suggestion is only for if they lose consciousness or cannot stay upright. They tend to breathe better that way.