4.15 from the left side would be average to a bit above average on the Major League scale.
4.15 from the right side would be well above Major League average.
There is no accurate way to equate what the time in the 60 would be. That is because players are similar to horses and greyhounds in that some are quicker at the beginning while others finish stronger. Also, the type of hitter and type of swing can make a big difference in H-1 times.
However, if you consider the home to first time and grade the runner above average... 6.7 range would be a good "guess", but it could be even better or worse. 6.9/7.0 is considered ML average.
Note: We have seen many more who can run a 6.7/6.8 in the 60 than we've seen run a 4.15 H-1. 4.15 is outstanding, especially with a full swing from the right side!
Best way to find out is to have someone time your 60.