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The center of gravity should be located at or near the center of lift, which is 20-25% down the length of the mean aerodynamic chord (MAC). Because a delta wing is shaped like a triangle, the center of gravity isn’t right in the middle. To find the center of gravity, you need to locate the MAC.  A wing chord is a line running from the front of a wing to the back of the wing. Since most wings are triangular, the chord length decreases as you move from the root (near the fuselage) to the tip of the wing.  The MAC is the chord of a rectangular wing that would produce the same amount of lift as the original wing.  The center of gravity is going to be about a quarter of the way back from the front of the MAC.