Supreme Grade swords are considered the highest level of quality and power among the Meito (famed swords) in the series. These swords possess exceptional abilities and are renowned for their strength and prestige. Currently, in the story, there are only 12 Supreme Grade swords known.

While Enma is a powerful and significant sword, capable of channeling Haki and cutting through immensely strong opponents, it has not been stated or hinted that it has the potential to ascend to the status of a Supreme Grade sword.

It's important to note that "One Piece" is an ongoing series, and new story developments may occur beyond my knowledge cutoff. To find out if Enma's status changes or any new revelations about the sword arise, it is recommended to continue following the manga or anime.