I know I'm a little late in getting that report to you, but I've been pulling out the stops to get it done.

帕姆：我知道我向您提交报告有点晚了，但我一直在竭尽全力完成它。

To pull out the stops means to use all of the pipes of the organ, and it's an expression here which generally means to do everything possible.

to pull out the stops 的意思是使用管风琴的所有管子，这里是一个表达方式， 通常表示竭尽全力。