Not claiming to be smart people, but it depends on what you mean by "available." The fastest probe that we could launch soon is a sundiver solar sail. It requires no new magical technological leaps. It has been explored mostly in service of the solar gravitational lens concept. [0]

The sundiver probe could go 547 AU in 17 years. Voyager 1 is at 162 AU. So around 5 years.

[0] https://news.ycombinator.com/item?id=41865107