No matter how good something thinks their babysitter or day care is --- it's always a very good idea to sometimes take an unannounced half day off --- or get out of work a few hours early --- just to be sure.
My 5 YO goes to a day care center for about 10 hours per week after kindergarten because I've gone back to school. I've watched their bus procedure from down the street and I've already dropped in for lunch. I purposely never told them what time each day I will be picking him up.
You HAVE to check up on these people.