A modern PC does not have to be off line. If you’re careful and don’t visit dodgy sites you’re going to be ok.
The PC maestro of Sound on Sound once said this.
But YMMV depending on how neurotic you are. Antivirii take such small footprints nowadays, there is no excuse.
Better to be safe ok, but to be off line, well, thats a bit luddite in todays world, no ?
My humble opinion, and no, i’ve never yet caught a virus.
Jerry