I have started to download it digitally and it went from 23gb to 5gb does this mean we have an in game download of 18gb
Yes, it will download the remaining size in the background, don’t worry.
So what your saying when it comes
Out at midnight I can still play it offline correct
Yes, if you fully downloaded the game, you can play at midnight, I do think you need to connect once to online for authorization to verify your copy, then you can play offline all you like.