I wouldn't worry about ketosis tbh. If you stick to the TFR regime then you will enter and stay in ketosis. When you do your first weigh in you'll get a nice surprise I'm sure!!! This diet rocks!
good luck i started on tuesday getting used to it apart from headaches, the shakes are great blended with ice they tast totally different just had a latte with 2spoons of coffee and the vanilla shake mmnmhow sad, lol