That depends how a new engine takes run after run at WOT to a higher redline. There is a lot of disagreement on modern engine break in. The manual says take it easy until 1000km (600 miles). So pressuming you get to 600 miles before you start the tuning process you should be okay.Any disadvantage to tuning a car with only 250 miles on it? Love the car but more usable power would be nice also.
I will say the more you drive the car stock the more you will appreciate the tune LoL. But that isn't a good reason to wait and you know it!