And what is the Future - only a mental construct in the Present. We can't experience the Future until it "becomes" the Present. Until then it only a hope and dream. We can project what the Future may be like, but we are considerably less accurate than when we remember the Past. There is no objective thing that we call the Future; it can't be measured in any way; our only contact with it is in the Present.

That leaves us with only the Present - the ever changing Present. Time is an illusion we created to try and measure the rate of change of the Present. It's always NOW. But it's an ever changing NOW. In a effort to cope with the change, we have invented time. It's a handy mental device that helps us deal with the higher order derivatives of the rate of change.

Although the illusionary nature of time is the deep truth in this matter, it's not particularly practical. To be totally in harmony with this truth, you'd need to wear a watch that always said "now". But you'd be late for a lot of meetings....