While the evolution of a star depends some on its metallicity, a 2 solar mass star doesn't get to that size even at its most bloated point in life. So no, Sirius B will never go supernova.

Can Sirius A go supernova?

As a main sequence star, Sirius A currently loses little mass, which escapes at high speeds, so Sirius B cannot easily capture it. ... In order to explode as a supernova, the white dwarf must increase its mass to close to 1.4 times the mass of the Sun, known as the Chandrasekhar limit.

What happens if Sirius B goes supernova?

For the discussion, experts discuss what would happen to Earth if Sirius B suddenly died and went supernova. ... Once this appears, the star's explosion would produce a very bright flash in the sky, which would take about 9 years to reach Earth. The bright light from the supernova would dominate the night sky for decades.