"Happy is that slave if his master on arriving finds him doing so." ?????

[Bible Speaks]

 "Happy is that slave if his master on arriving finds him doing so."—Matt. 24:46.

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The fact that we receive spiritual food just when we need it proves that Jesus, the Head of the congregation, is keeping his promise to feed us. Whom is Jesus using to feed us? When Jesus told his disciples what the sign of his presence would be, he said that he would use “the faithful and discreet slave” to give “food at the proper time” to his “domestics.”* (See endnote.) (Read Matthew 24:45-47.) 

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In this time of the end, Jesus is feeding his true followers through that faithful slave. It is extremely important that we know who the faithful slave is. Our friendship with God depends on receiving spiritual food through this faithful slave.—Matthew 4:4;John 17:3.

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Jesus gave the faithful and discreet slave an extremely important responsibility. In Bible times, a trusted slave, or steward, managed everything that belonged to his master. (Luke 12:42) 

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In a similar way, the faithful and discreet slave has been given the responsibility to manage everything on earth that belongs to Christ. That responsibility includes caring for money, property, the preaching work, and assembly and convention programs. 

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It also includes making Bible literature that we use in the field ministry, for personal study, and for congregation meetings. The domestics depend on all the spiritual food that is given out through the faithful slave.

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https://wol.jw.org/en/wol/d/r1/lp-e/402013533?q=matt+24%3A46&p=par