Taken in a vacuum, it is difficult to know exactly what this means. However, in the context of the rest of the paragraph that it nestles within, it's clear that the writer is saying that his life is "fruitful labor" for the kingdom, and his death will be welcomed because he will be with Christ.
Philippians 1:21 (New International Version)
Lord, may I be a blessing to someone today. May my labor be fruitful for the kingdom. May I be a useful enough servant that it is indeed "more necessary" that I be here rather then going on to my reward, but also help me to trust that you would work even my death to the good of those in whom I have tried to instill a love for You.
Give me a back strong enough to carry whatever cross you have for me today, and to do it while setting an example of the fruits of the spirit.
Give me enough of You within me to fill the gap between what I can do and what I should do.
In Jesus' name, so be it.