All new-build 777s have had the tail-skid removed, as, as has been said, the software has been updated.
I'm not aware of much incidence of tail-strike in the 300ER in any case- the semi-levered gear and control logic seem to make it easy to avoid.
The "straight" 300 is another matter- but they have skids.
I assume there is still a Tailstrikes detector fitted as well as the appropriate EICAS warnings.
Actually, no and no- there is no detractor and the EICAS message has been removed.