It was always supposed to open in theaters on July 17, 2020, and that is exactly where it stayed.
According to reports, Nolan wanted his movie to be the first to reopen theaters after the the threat of the coronavirus passed.
According to Deadline, in the interim Warner Bros. will put a 10th anniversary print of Nolan’s Inception into theaters, which will include “a never-before-seen look at footage from Tenet.”
And when the most recent Tenet trailer premiered online it ended with the language “Coming to Theaters” without specifying a date.