There are all sorts of answers and most of them are on the internet with enough effort. There are numbers from the combines and pro-days. Sometimes there are other "work-out" numbers as well. For example at a "work-out" AJ was reported to run a 4.27. At his pro-day it was more like 4.37. DD's combine was about 4.63. Try searches like "player name prospect profile" or profiles, "player name combine 40," etc.