FedEx and UPS aren't making guarantees, but they're doing their absolute best to meet all time lines. I trade/buy/sell craft beer for a hobby, and so far none of my deliveries have been late. With the weather and temps, it's probably not going to hurt anything to go an extra day, but that's all about your comfort level, of course. A lot of folks won't risk their animals (and I definitely wouldn't once temps go higher).