The Daleks would meet no noteworthy reistance in the entire galaxy, and then they’d go back in time and find no resistance there. Seriously, Planet-busting weaponry is standard on every Dalek ship, which they have a practically infinite amount of because time travel. read more
Bonus Scenario: The Doctor and the Master are both teleported into the 40k Galaxy along with all their companions, their mission: Save the Imperium of Man, stop the forces of Chaos, and bring peace to the Galaxy. Like the Daleks they are also time locked and must also find a way to bring the war to an end. read more
The universal daleks either blow the galaxy up (like the significantly less advanced humans did), or the just build the reality bomb on the other side of the universe and laugh as it proceeds to annihilate everything in the 40K galaxy. Warhammer may be powerful, but it pays some respect to the laws of physics. read more