Yes, make sure the dipstick is definitely seated. Kind of a weird oil leak if the oil is on too if the valance cover, instead of seeking out and down the side of the heads.
Seeing you have a 2016, the following TSB was issued for all 2015-2017 5.0's because Ford realized the valve covers should have additional fasteners to prevent seepage. Not sure if it applies in your case since your image is showing oil on top of the valve cover, which is odd. But in any case, check this link: https://www.mustang6g.com/forums/threads/valve-cover-leak.131014/#post-2705151