Found these instructions online and it worked!!
download the CommandAndConquer3TiberiumWarsv1.09NoDVDFixedDllEng.rar file from GameBurnWorld and decompress it with unrar or stuffit expander
No DVD Crack :
http://www.gameburnworld.com/dl/dl.php?file=CommandAndConquer3TiberiumWarsv1.09NoDVDFixedDllEng.rar
Pro Instructions:
Replace the cnc3game.dat file with the one your got from GameBurnWorld at the path /Command and Conquer 3/Command and Conquer 3.app/Contents/Resources/Command and Conquer 3.app/Contents/Resources/transgaming/c_drive/Program Files/Electronic Arts/Command & Conquer 3/RetailExe/1.9/cnc3game.dat
Easy Instructions:
Step 1 - Control-click (or right-click) on Command and Conquer 3 to show package contents
Step 2 - Navigate to /Contents/Resources/Command and Conquer 3 and control-click (or right-click) on Command and Conquer 3again to show package contents
Step 3 - Navigate to /Contents/Resources/transgaming/c_drive/Program Files/Electronic Arts/Command & Conquer 3/RetailExe/1.9/ folder and drop in the new cnc3game.dat you got from GameBurnWorld.
That's it.