OK, Shepard did every option right, he purchased all the DLC and everyone is happy. As a result, everyone is in the fleet. Asari, Turians, Geth, Humans, Quarian...everybody.
They give the signal and everyone jumps. There is a dimensional rip, and the end up materializing right at the Covenant's doorstep right after Truth ascended to power, but before the war with humanity. Both sides are at the height of power.
The battle is joined as a grunt accidentally trips and lands on the fire control of a plasma launcher.
Who wins?
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#Offtopic
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Let's put it this way in terms of overall battles (space is pretty much the only thing that matters in this kind of scale). UNSC would maybe be able to beat the combined mights of ME in a year at the very least. Covenant would be able to beat the combined mights of ME in a month or two. Ancient Humanity would be able to slam ME in a week. Forerunners would be able to wipe the floor with ME within a day. Precursors would be able to laugh and put them out of their misery within a few minutes.