diskutil info `bless --getBoot` | grep -iE 'size|space'  
 Disk Size:                 494.4 GB (494384795648 Bytes) (exactly 965595304 512-Byte-Units)
   Device Block Size:         4096 Bytes
   Volume Used Space:         11.2 GB (11244834816 Bytes) (exactly 21962568 512-Byte-Units)
   Container Total Space:     494.4 GB (494384795648 Bytes) (exactly 965595304 512-Byte-Units)
   Container Free Space:      400.9 GB (400942043136 Bytes) (exactly 783089928 512-Byte-Units)
   Allocation Block Size:     4096 Bytes