An adverb meaning 'before long' or 'soon'. In some contexts it can mean 'even now' or 'at this very moment'.
今に雨がやむだろう。
The rain will stop before long.
彼は今に成功するだろう。
He will succeed someday/soon.
今に泣き出すかもしれない。
They might start crying at any moment.