The AP has tweeted that Keanu will be honored with a handprint ceremony at TLC Chinese Theater tomorrow, May 14, 2019. The TLC Chinese Theater was previously known as Grauman’s Chinese Theatre. Other handprint ceremonies in April and May of this year took place at 11:30 AM so, I expect Keanu’s ceremony will also take place at this time.
Update: Thanks to one of my readers who called The TLC Chinese Theater for more info. She was told that the schedule is anytime between 8 AM and 2 PM. The studio/rep did not specify a time. It sounds like it will happen when Keanu decides to show up.