米奇，RSU是这样的:

三个时间点

Grant date 

vest date

sale date

RSU是unsecured conditional promise to stock. If all conditions meet then it becomes vested. You cannot do anything before it was vested because it is not your stock it is only a promise.

You can only sell the stock after it is vested. 所以尽早 best is my advice. You can also hold onto the stock and sell at a later date.

tax implications: 

Grant date: no tax

vest date: ordinary gain/loss = you cost and fair market value (FMV) on vesting date

sale date: long-term or short term capital gain on ==>> difference between FMV @sale - FMV @ vesting