1. call it a day ( to decide to stop doing something)
2. eleventh hour (at the last moment)
3. matter of time (it is certain to happen at some time in the future)
4. better late than never (it is better to do something after it was supposed to have been done than not to do it)
5. time flies (time passes quickly)
6. in good time (something will happen at the appropriate time and not before)