If it is nursery grown, it is probably a couple of years since it's been grafted. You may get a fruit or two next year. In four years it will probably produce more fruit than you can eat.

If it's been outside, a frost should not hurt it. Avoid temps below 26 deg F. A cover, like a blanket, when it gets below 30 deg F would be helpful, but not necessary.

Thank you so much. It is a grafted plant. I was just hoping that it wouldn't be 10 years before it produced anything. I do plan on covering it when it gets cold even if it isn't required just to tryto keep it safe. I've never grown any citrus before so I want to try to keep it as healthy as possible. thanks again.