From: Swahili, East Africa
Source: Swahili (East Africa) oral-tradition proverb (Achanikaye kwenye mpini hafi njaa), Swahili Proverbs project, Department of African Studies, University of Illinois (swahiliproverbs.afrst.illinois.edu) — hoe-handle entry
The source explains it: a diligent worker will reap the fruits of his industry
. The wording of the meaning is ours.