Being that the Db chord structure is without a 3rd (Major or minor), the chord is neither Major nor minor, so to speak. With that exposed, I would say that the chord is a Dbsus2, because the Eb is taking the place of the missing 3rd.
From My understanding of theory, in order for the chord to be named
DbMaj7(9), the F note (M3) must be in the chord voicing and the 5th could become the optional note, if desired. Otherwise, the 7th interval just becomes an added note in the Suspended chord.
That's just my opinion of what this chord is.

Others may refer to it as a DbMaj9 (no 3rd), because it does have a M2 interval present.
Hope it helps....................