For those wondering, “is mail being delivered today”, unfortunately, there is no USPS mail time estimator available on their website. However, there are general timeframes that we can assume most packages will fall under.
The average USPS estimated shipping time usually takes anywhere from three to four days for standard mail delivery.
The amount of time this takes can go down if you use priority or priority express mail. However, if you are mailing within the same zip code, your mail could arrive as soon as the next day.