SAINT-DENIS, France — The youngest member of the U.S. track and field team hinted Thursday that he will soon make his Olympic debut.

“Tune in Friday morning at 5:05 a.m. EST,” wrote 16-year-old runner extraordinaire Quincy Wilson on Instagram, apparently alluding to the start time of the preliminary heats of the men’s Olympic 4×400-meter relay.

Wilson was informed that he will be the first to lead the U.S. relay on Friday morning, his coach Joseph Lee told Yahoo Sports on Thursday, confirming a report earlier in the day by Chris Chavez of Citius Mag. USA Track & Field does not officially announce its relay lineups until shortly before the start of the races.

At 16, Wilson is the 11th fastest man in the world in the 400 meters this year and the fourth fastest American. He earned his spot in the American relay pool earlier this summer when he ran three consecutive sub-45-second times at the U.S. Olympic qualifying heats. A few weeks later, he set a new personal best, improving his U18 world record to a blistering 44.20 seconds.

Wilson is already the youngest man ever to make the U.S. Olympic track and field team, about a year younger than middle-distance runner Jim Ryun, who competed in 1964 at the age of 17 years and 137 days.

US relay coach Mike Marsh decided not to let Wilson run a leg of the mixed 4×400-meter relay last Friday or Saturday. Vernon Norwood, Bryce Deadmon, Shamier Little and Kaylyn Brown set a world record in the mixed 4×400-meter relay in the preliminary round and won a silver medal in the final.

The heats and final of the men’s 4×400-meter relay are the last races Wilson can compete in at these Olympics, otherwise he would go home without ever having run on the Stade de France’s distinctive purple track.