Listing expected graduation GPA along with current GPA for grad admission of senior undergraduate
First the difference between a GPA of 3.76 and 3.8 doesn't seem very big or relevant to me. Beyond that, in general I would not put the two numbers in the application. Put the GPA of your already graded courses, so the 3.76 and write next to it that it is preliminary and in particular does not contain your thesis grade yet, which accounts for 20% of the total grade. With that information anyone reading your application can make their own estimate of what your final GPA will be.