@N7turbo
Here is some of the information which was recorded during a simple drive; which I think you'll find valuable. This log involves a cold start in my garage. Notice at around the 50 second mark, (which is when ignition timing is initially retarded. Notice how engine load is at 100% during this process. This is on a fully custom 91 Octane tune. (Skyactiv 2.5 NA) and with a cold start delete, which essentially lowers engine rpm to around 1250rpm, as seen in this log.
So, regardless whether it is cold or not, start the car, let it idle until engine speed drops, and put it into gear.
Or, you can skip the process and put it in gear sooner. Engine operation adjusts, and it goes into gear the same as otherwise.
I like to park backwards at the end of my drivetrain, start up while rolling, pop into gear. Less strain on both drivetrain components.
So if you're really concerned about placing high load on your engine when cold, its trivial whether you wait or not. What really matters is how you treat the vehicle in general.
As you can see in this drive (which includes hills) I am quite gentle on the throttle, staying mostly under 2000rpm. Yes, occasionally rev to 2500rpm, where it makes most of its torque. Yes, I do take it full throttle. to around 5000rpm. But I am not 17 anymore. I do it when needed, with purpose.
if you care about your engine, especially with the additional complexities of a turbocharger, keep your engine load around 50% or so.