The halted production may not just affect this series, but Jared Padalecki's upcoming project as well. This project, which is also for The CW, is known as Walker. But if production on the final episodes of Supernatural is delayed too long, it may result in a delay for Walker.

Jared Padalecki in Supernatural
All of this doesn't just affect one CW series final season, as another series is also currently working on its last season. I'm talking about The 100. The cast and crew of The 100 would've started in the upcoming week. For now, they're hoping that they don't have to send anyone home due to the coronavirus. The premiere of the final season is still planned for this spring. For now, production on most CW series is halted.