Roman Reigns has been off TV since March 20, when he and Goldberg signed the contract for their WWE Universal championship match at WrestleMania. Shortly after, Roman Reigns pulled out of the show, due to the COVID-19 pandemic.
According to Dave Meltzer of the Wrestling Observer Newsletter (subscription required), WWE is unsure when Roman Reigns will be back, as they have left it up to him to decide when he returns. Roman Reigns is immunocompromised due to being a leukemia survivor, and made the decision to stay at home with his family so as to not contract the virus and endanger himself or his family.
WWE recently made the decision to go forward with weekly live tapings, and while that may be a controversial decision, it is good to know they are allowing Roman to remain healthy by staying at home.
We will update you with more information as it becomes available.