Concrete blankets usage

Monday of this week, I had a concrete slab poured for a workshop (18'x 22'). I have covered the slab with concrete blankets every night this week due to night time temperature getting close to Freezing here in Denver. Our day time temps have been around 60+. Tomorrow (Friday) the high is suppose to be in the mid 40's.
My question is would it actually help to have the blankets on tomorrow. I was going to put them on tonight and then remove them tomorrow morning and return them towhere I rented them from. The rental place is closed for the weekend and I'm paying a daily rental fee. If I leave them on Friday, I'll get charged for the weekend.
Any thoughts?
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