What we’re seeing is 70 million years ago. It already went supernova.
Smile. Wait for the flash!
No. About 1500 years ago. It will take about 70,000,000 years to accrete enough of the larger star’s mass onto the white dwarf to cause the blast.
By that time Earth should be a cinder from global warming, if it still exists. I say that because as the warming continues and goes out of control eventually the carbon atoms will start fusing and eventually end up as iron atoms with a blindingly hot atmosphere surrounding it. Getting hotter and hotter without limit. Or so Al Gore says.