Jem Aswad Senior Music EditorJ Balvin has postponed his long-awaited “Jose” tour, which was scheduled to launch next week in San Antonio, citing Covid-related “unforeseen production challenges.”The six-week tour was scheduled to cross North America before wrapping in Puerto Rico on June 4; he was also scheduled to appear at the Viva LA Music Festival in Los Angeles on June 25. A quick look at Ticketmaster shows a large number of unsold tickets in many venues on the tour.Balvin, who recently released two songs with Ed Sheeran, “Sigue” and “Forever My Love,” is renowned for elaborate and eye-popping concert tours like, his 2019 “Arcoiris” tour, which stunned the Coachella audience and then traveled across the world.