So apparently SpaceX is building many of those all the time and the latest spotted one in development is Starship 42: https://starship-spacex.fandom.com/wiki/Ship_42_(S42)
I guess how much of a setback this is will be determined by how much damage is there on the facilities and the nature of the cause of the explosion(do they need to re-work the next 6 already being assembled so it doesn't happen again?).