“Oppenheimer” continued to streamroll through Hollywood’s awards season on Saturday, winning the top prize, for outstanding cast, along with awards for Cillian Murphy and Robert Downey Jr., at the 30th Screen Actors Guild Awards.As the Academy Awards draw closer, Christopher Nolan’s blockbuster biopic — already a winner at the Golden Globes and the BAFTAs — has increasingly looked like the run-away favorite. The SAG Awards, one of the most-telling Oscar predictors, will only add to the momentum for “Oppenheimer,” the lead Academy Awards nominee with 13 nods.
Kenneth…