adverb
now is the time; this is the moment
Emphasizes that the present moment is the right or long-awaited opportunity to do something. Often used in persuasive or dramatic statements.
今こそ行動を起こすべきだ。
Now is the time to take action.
今こそ、その夢を実現するチャンスだ。
This is the moment to make that dream come true.