Sadly, Puerto Rico has been devastated by 140-155 mph winds, as the storm weakened just a bit from the 175 mph winds a few hours before landfall, due to an eyewall replacement cycle, which reduced wind speeds near the center, but also led to a larger storm with greater winds further from the center.
In addition, Maria featured record 6-10 foot storm surges, and 12-24" of rain or more in the mountains (with 6" or more to come, as Maria pulls away), leading to unprecedented flooding and mudslides. The extent of the damage won't be known for days, but it's already known that the entire island is without power and running water (or working sewer systems) and there are reports of major to catastrophic damage to many to most buildings, including devastation of entire villages and towns. See the NY Times report below for details.
With regard to where Maria, now a Cat 2 hurricane with 110 mph winds and a central pressure of 958 mbar (way up from the top 10 all-time low pressure it had of 909 mbar last night) will go, it's likely that she'll shoot the gap between the US east coast and Bermuda, staying off-shore, but that's still too far out to be certain. See my post above for more on Maria's track.
https://www.nytimes.com/2017/09/20/us/hurricane-maria-puerto-rico.html