Anything that has just been experienced and thought and has not yet been forgotten is still present but when did the “now” happen?

Was it when the experience started? If your told to start walking now, does the now start when your foot crosses the starting line, or does it start when your told to start walking now?

Just because a person seems to be standing on the starting line is it fair to assume that the course to be followed or the goal for doing so is known? Maybe “now” includes finding those things out?