How to check if ureadahead functioning
Solution 1:
This version of ureadahead has been around since at least the start of 2015 and I doubt it was written with systemd in mind. I don't know what bumped the minor versions but last commits are from 2010. They probably included some of the merge requests since your version is reporting cpu count.
The dev is now working for Google.
Your best bet at this point would be to keep it disabled. If looking to shave off a couple seconds off boot, remove wpa_supplicant if not needed.