I wait for 2 days after the chrysalis has been formed, until it has firmed enough to gently handle, before I transfer it onto a toothpick so it can hang safely until it emerges as a butterfly.
So now my little charges are all hanging on toothpicks, marked with the date they formed the chrysalis. I keep their details in a notebook, so I can check how long until they'll emerge as a butterfly. It differs at different times of the year and in different temperatures.
At this time of year it's 9-10 days. So now we're waiting........... 🦋