No, the launch of the ViteX and the Main network will not be at one time. ViteX in June, MainNet in Q3 2019, there is no more accurate date.
What advantages will have your blockchain before a lot other? As I understand you are using v - the same technology as are using fantom, IOTA and some other projects?
What advantages your Vite exchange will have before other exchanges like Binance DEX?