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Either that, or there’s only the present and there’s no such thing as the past or the future. >

I think OP is probably more correct as seeing, hearing, smelling, tasting and feeling things all have a processing time and occur factually after the point of time in which you are experiencing them. >

This is interesting. What do you mean by “time”? >

A measure of distance traveled.
A measurement of decay
An atomic frequency. 
The 4th dimension. 
A fabric of space. >

I’m sorry, I understand seeing, hearing, smelling, tasting, and feeling as processing one’s environment, but I don’t know what you mean by time. >

It's a fabric of space.
A measurement of distance that can be distorted by mass.
Your brain uses a measurement of time to process your experience.  By the time you've fully processed that experience the time in which you are experiencing has already passed atomically >

we're always in the present, but by the time we know it, we aren't >

But what about now? No, wait.... NOW! Dammit.. wait five seconds then say "now." You predicted the future and your mind allowed you to conceive it, and it happened in the present while the present existed, or will exist soon.