That's the hardest question ever.
Assuming Schools start to re-open in March figure will no doubt go up as well.
Personally I think we need to be at the most in the mid single thousands infections per day....that however, may never/not happen until late April/May.
I'm lucky that financially living as we are in no hardship all I miss is playing Golf (spring to autumn), going to City and going for an afternoon beer. I'm fully aware that other people have mental issues, financial ones, family issues, a vested interest is hospitality etc. In essence it's the Govt job ideally taking advice from Scientists who should be looking at the position impartially.