He will for sure. Knowing Goku, he will even help the Guardians in their fight and save the day for the Traveller. Once the Guardians realizes how powerful he is. they will team up with him and defeat the Darkness. The Traveller will be restored and help Goku get back to his own universe. Goku is good hearted. He will see this Earth as in danger and help turn things around. There is really no reason for the Darkness and Light to team up and try to kill Goku.
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Given the wording its simply goku vs all. I don't doubt for a second d that if he were to team up with the gaurdians it would be a cake walk, but all vs 1 with no information and an insanely high chance of encountering the darkness or fighters for the darkness other than a guardian are severely higher based on numbers alone.
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Story wise, Goku just got a major upgrade this year. He is now way beyond what he was during the DBZ saga. He is now even way more powerful than GT's SSJ4 Gogeta which is non canon, btw. He is now a Super Saiyan God Super Saiyan. His base power is now Super Saiyan God and so far, he was shown to reach SSGSS level 1 (blue hair). He can keep teleporting between planets and destroy each and everyone in the Destiny universe one by one in an all out fight.
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I saw the movie, I know its not cannon. But he ain't bending time. He has habits that he always follows. Just like James Bonds villains always explain the plan before they kill, goku has a routine for dealing with enemies, known and unknown.