Well there ya go I guess. Time travel into stalin's office and give him that info, plus a bunch of other math and science shit, then come back to the present and enjoy your communist utopia :)

I suppose also throwing in some supperior agriculture technologies and some tailored gmo crops could also help significantly. Additional info on the haber process and modern catalysts would also ensure long term food security.

Our modern world is built on chemical knowedge that wouldn't be widespread for a while, partially due to the difficulty in computation. Throwing an assload of precompleted qmech calculations about common molecules would be useful, as well as modern chemical manufacturing processes.

Modern medicine would also be a huge one. I have to imagine that many of the injuries sustained in ww2 could have been treated with modern medical knowledge. Even a slight decrease in casualty rates would have big effects long term not to mention the societal benefits of advanced medical care.

Nuclear energy would also be hugely important, and some of the bomb making parts could be quickly repurposed into nuclear power. Advanced nuclear early on (with modern turbines and such) would have huge affects on preventing climate change.

Computers would probably be the most significant thing long term, allowing for better automation of the soviet economy and more effective material distribution.

Obviously you would want to include as much as possible but it would be important to highlight the highlights.