Until now

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interviewer : Mmm-hmmm. Since the show is on twenty-four hours a day without commercial interruption uh… all those staggering revenues are generated by product placement.

Christof : That's true. Everything on the show is for sale. Actors wardrobes, food products, to the very homes they live in.

Interviewer : And of course all of it available in the ‘Truman Catalog.' Operators are standing by. Christof, may I ask you, why do you think that uh, Truman has never come close to discovering the true nature of his world until now?

Christof : We accept the reality of the world with which we're presented. It's as simple as that.

Have you seen truman show on movie?

'until now' indicates in the past "truman never come to close to..."and now "truman has come to close to..."

I take for granted 'until now' has to be replaced with 'yet', 'so far'

What's the reason 'until now' is written in above scenario?

"We will be opend from Monday until Thursday from 9am to 6pm."

as it has possibility of 100%, Do business on Thursday?

Please Do not approach English grammar.

I expect you to think of it in your every life not a English grammar.

thanks.