The load average (3 are shown) are the average number of processes waiting for the attention of the CPU over a period of time.
The period of times of the 3 shown are 1 5 and 15 minutes.
Therefore, the first figure is the average number of computational processes over the last minute. The second number os the average over the last 5 minutes and the final figure the average over the last 15 minutes.
If you want a perfectly running server with no CPU contention then you want the figure to be <1 average of any extended period of time.