I have experimented with and done research on mock scrapes on and off for about 20-years. At times, I have had great success, usually on scrapes I started during our spring turkey season. However, scrapes started a few weeks prior to your rut, may get "opened" faster. The key being location-location-location. That is a topic by itself and I won't go into it here.
I will say this. By far, my most successfull scrapes have been started with my own urine. In fact, for many years, my own, human urine is all I use. Now for the bad news.
I have never seen a mature buck visit a mock scrape in daylight. I am sure they do, I have just not seen it. For me, from a practical point, they have little value as a hunting-killing tool unless you are doe or small buck hunting. In that case, they may be of some marginal value, certainly no worse than a "natural" scrape. And, they would not be season specific. They are as likely to produce activity at 10:00 a.m. opening morning as during the peak of the rut. Obviously, I do not hunt scrapes, they are an important informational tool for me, nothing more.
That said, and I mean this literally, if you want to make a mock scrape, pick a good location with a severaL choices for licking brnaches and take a healthy whizz in raked, soft dirt.