Ready washed lettuce

It’s been wet here today, like many places in the south east I believe.
So it was a walk round the garden when it had eased off somewhat.
My lettuce is the lucky winner of blip choice today. Ready washed, but is it ready to eat? To be honest I’m going to have to look it up. Another first for me in the veg growing process, so I don’t know when to harvest it.
I keep hoping it will be obvious - if anyone knows the answer, please let me know!