Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 1 year ago

Bismihi ta'ala

If you pray the nafilah prayer, then that is the mustahab thing to do, to pray it on its time, and then pray the wajib prayer, and with doing this, you will not be deprived of anything. 

You will gain the reward of the nafilah prayer, and the reward of praying on time, which in reality that is what you are doing. 

Therefore, there is no need for you to pray the nafilah prayer before its allocated time. 

And Allah knows best.