It will air Thursdays at 8:00. I would just as soon have no crossovers, not a fan of SVU or Organized Crime.

https://tvline.com/2021/11/12/law-order-revival-premiere-date-nbc-season-21/

NBC teases Law & Order Season 21 (https://www.primetimer.com/item/NBC-teases-Law-amp-Order-Season-21-62S5Jv)

The network on Thursday night released the first promo for the Law & Order revival, featuring original star Sam Waterston and newcomers Jeffrey Donovan, Odelya Halevi and Hugh Dancy.