Only those who think that they'll soooooooon be king/priests, can be called "witnesses" and do preaching work.
w98 2/1 p. 17 par. 16 - In 33 C.E., the Israel of God (not r/f JW's!) replaced fleshly Israel and became Jehovah’s “servant,” his “witnesses.”
w98 12/15 p. 18 par. 10 - Jehovah has committed the ministry of reconciliation to the anointed, so Paul could say: “We (the "anointed class") are therefore ambassadors substituting for Christ, as though God were making entreaty through us. (the "anointed class") As substitutes for Christ we (the "anointed class") beg: ‘Become reconciled to God.’” (2 Corinthians 5:20)
No need to even tick a box each month. Woo-hoo! 😁