Current vaccine targets EG.5. I don’t know how close JN.1 is though.
It seems like COVID protection is a gray sliding scale. EG.5 is better than BA.5 vaccine is better than original vaccine is better than nothing. But with enough mutations even EG.5 vaccine isn’t enough to prevent mild illness / staying home from work for a few days or causing you to spread COVID-19 JN.1 to your friends.
But the vaccines seem really good at preventing severe illness that sends people to the hospital or graveyards.
We need to stay educated on the vaccine and it’s efficacy to changing variants.