Macarons are best when refrigerated until the next day or even 2-3 days later, which allows the flavor to infuse into the shell.
Macarons freeze well and keep for up to 3 months.Freeze in a single layer, once frozen they can be layered in between sheets of parchment in an air-tight container.
Chef Treand recommends using Deglon Rubber Ended Maryse Spatulas