In the Alignd timeline the bots & cons did not go to Earth right after leaving Cybertron. They visited numerous former colonies first, bots did it because the Matrix pointed them in that direction, cons did it so Megatron could kill Prime and take the Matrix for himself.

If you plan to use thr games as your backstory then will also have to use the books otherwise it will not be modern day Earth they arrive on.

The Great Exodus took place a few thosand years ago.