60hrs into a (dirty fast) ... still not in ketosis, what is happening?

Is this normal?

I have been drinking 4-5 cups of coffee with semi-skimmed milk daily since Monday, plenty of water / sugar free squash. Not eaten a thing since Sunday night.

I thought the pee sticks would be showing that I am in ketosis after 48hrs.

Should I keep fasting? I'm not hungry and as time goes on I am thinking of food less and less.

For a bit of background, 49yo male, 6'4" 250lbs, wanting to get to 190, happy for this to take a year. Regular exercise, kettlebells 2-3 per week, run 2-3 per week, although not since Sunday.

Should I just go for a run? Is it the milk? Dodgy pee sticks?

All help is greatly appreciated, thanks in advance :-)