Realistically, there's a 30 day lead time between the time the executive team pulls the trigger on the 72 Hour Test, when the ride can pass the 72 Hour Test, and finally when training of Ops CM's can begin. And that's assuming the attraction passes the 72 Hour Test. It's not unheard of to have a new ride system fail a 72 Hour Test, which sends WDI back to work to fix whatever faults were found during the test, then do more follow up, then schedule another 72 Hour Test and cross fingers.
But for the purpose of the casual readers here in this thread, and to get more OT about when this ride may open, here's the timeline that would play out for opening ROTR. This assumes a 30 day lead time between when the 72 Hour Test gets a green light, plus 90 days of Ops Training to get 200+ dues paying Union CM's trained with a 3 week scheduling lead time. Plus four days of pad time for media events, previews, whatever.
If the 72 Hour Test gets approval this Monday, June 3rd, the ride opens Friday, October 4th. That's best case scenario and the earliest date humanly possible at this time.
Here's the rest of that basic schedule through the end of calendar year 2019, based on executive approval of a 72 Hour Test and then perfect timing and a little luck thereafter:
Approval Monday, June 10th, the ride opens Friday, October 11th
Approval Monday, June 17th, the ride opens Friday, October 18th
Approval Monday, June 23rd, the ride opens Friday, October 25th
Approval Monday, July 1st, the ride opens Friday, November 1st
Approval Monday, July 8th, the ride opens Friday, November 8th
Approval Monday, July 15th, the ride opens Friday, November 15th
Approval Monday, July 22nd, the ride opens Friday, November 22nd
Approval Monday, July 29th, the ride opens Friday, November 29th (that's Thanksgiving weekend, so highly unlikely, probably bounced to the following week)
Approval Monday, August 5th, the ride opens Friday, December 6th
Approval Monday, August 12th, the ride opens Friday, December 13th (I dare you to open a new E Ticket on Friday The 13th. I dare you!)
Approval Monday, August 19th, the ride opens Friday, December 20th (now you are in the peak Christmas weeks, probably bounced to early January)
Approval Monday, August 26th, the ride opens Friday, December 27th (same as the previous week)
Approval Monday, September 2nd, the ride opens Friday, January 3rd 2020
Continue that timeline into early 2020. Rinse and repeat.
Like I said, that "Opens later this year" tagline for ROTR is not just vague, it's wildly optimistic.