What’s the movie where Bill Pullman plays the main character where an asteroid destroys his small town..?

Question

...and there are visitors from the future whom have arrived especially to witness the destruction happen.?

Answer 1

Yes it was Grand Tour: Disaster in Time. It wasn't Bill Pullman, it was Jeff Daniels.

Answer 2

Grand Tour: Disaster in Time (1992)

aka Disaster in Time

aka Timescape

starring Jeff Daniels, Ariana Richards, Emilia Crow, Jim Haynie, Nicholas Guest, Robert Colbert, Time Winters

IMDb synopsis:

Before they can complete renovations on their new inn, Widower Ben Wilson and daughter Hillary are visited by a woman seeking immediate lodging for her strange group of travellers. Why they won't stay at the hotel in town is just the first of many mysteries surrounding the group that lead Wilson to a startling discovery affecting his family and neighbors.

They ARE visitors from the future who go on tours throughout time to sites where disasters occur.