If I have a reservation say for 8pm but am not thier exactly at that time if I got thier at 810

We just experienced that..... It was crazy busy and we missed our reservation by 10 minutes and were put back on the wait list. It took another 30 minutes for us to get a bay.

Then make the reservation and call them and let them know.

They'd probably be able to get you in, but you might wait a bit longer. It's better to be on time.