Scrutineering pretty much all day on Sunday and Monday. Free practice Wed 16:00-20:00, quali sessions Wed 22:00-00:00 and Thu 19:00-21:00 and 22:00-00:00. Friday - drivers' parade 18:00-19:00, and Saturday... warm-up at 9 AM, 10:30(ish) the Group C race, and then the cars are rolled out onto the grid some time before 2 PM, they form up on the grid some time before 14:40 and are flagged off around 14:51-14:52 for the pace lap to finish at 15:00 on the dot (all in local time, based on Wiki and on last year's schedule). France is GMT +1h (UTC +2h in the summer).
Radio Le Mans will have reports from both Sunday and Monday scrutineering, and they'll be going fully live from the circuit some time on Wednesday afternoon, a few hours before the start of practice.