There's a whole raft of "Rifts for Savage Worlds" products now (https://www.peginc.com/product-category/rifts/), but really I think you need only the following two to get going:

https://www.peginc.com/store/rifts-the-tomorrow-legion-playe...

https://www.peginc.com/store/rifts-game-masters-handbook/