What have you been doing until now?
Koichi had a million girlfriends up until now, but he is finally about to settle down with one woman.
You are the best girlfriend I’ve had so far.
You know that 今 means now. What you probably don't know is that まで means "until." So, this word means until now.
The reading for this word is the kun'yomi reading which you learned previously when you learned the vocab word 今. You can tell this is a kun'yomi reading because it has hiragana attached. So if you know that, you should be able to read this word as well.