Whew, this is a real complicated one.
There are so many point and angles to consider. From a Halachah stand point I think it would be ok. But then there’s a hashkafa’dig view. WHY WOULD YOU WANT TO PREPARE FOR ANOTHER DAY? Where’s your Emunah?!? Looking at it from an emotional viewpoint, won’t it be depressing knowing that you’re already started the next workweek? From a financial viewpoint, how do you bill those minutes spent sharpening your pencils now for next week – it could really get complicated.