When do I start acclimating my seedlings outside?

in Fruit & veg
I’ve been growing some herbs in a propagator and I read you should start acclimating them once they have 2 or 3 leaves on them. 
Would you say these were ready or should I leave a little longer?

Would you say these were ready or should I leave a little longer?
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
What are you growing?
Also grow caraway, the rest of my herbs manage to come back each year thank goodness. Like you still waiting for consistently warm weather to get planting outside. Good luck with them all and hope you have a good harvest