What exactly do you mean under Thrace? It's a
https://en.wikipedia.org/wiki/Thraceregion that's shared by three countries, with the Bulgarian part the largest and the Greek is the smallest.
As for Turkey keeping any part of Greece, this is completely out of the question, since Greece is an allied country. Giving the Dodecanese islands to Turkey would be a very good way to help the Greek communists win the civil war.
In any case the scenario is exceedingly unlikely, since Turkey was then a much smaller country with a poorly armed military. Even by July 1944 the Axis could still do a lot of damage to Turkey or at least delay their advance long enough for the Soviets to move in even easier into Bulgaria.