A modern day aircraft carrier with bombing-capable jets that can outspeed the Luftwaffe, and it comes from a future where the Nazis utterly lose and appearing in Britain's Darkest Hour and knows all the sins the Nazis will do & also some of their weaknesses? I assume Germany's pretty stuffed.
How stuffed would depend on how long HMS Queen Elizabeth and its jets can go to war when all their ammo and spare parts are in 2019. If it has 24 Lightning II's onboard, how many missiles and bombs does it have before they're out? And how long can it stretch that in a way that implies they've got a hell of a lot more, be afraid?