Read this guide about Dragon Ball Z: Kakarot or DBZ Kakarot's pre-load dates and download sizes.
Pre-Load Dates and Times
Pre-Load Game and Be Ready
The official release date of the game is January 16th , but you are already able to pre-download your game so you are up and running when the game comes.
You will be able to download your game starting January 14th 00:00 JST which is approximately January 13th 7:00am PST .
Dragon Ball Z: Kakarot's Download Size
Source: Kakarot Reddit Page
The full download size of the game has not been officially released, but the game's size is approximately 31.04 GB .