correct. as the crank and cam are moved into different positions, you can expose different oil passages then the oil can flow. ie reposition and prime, reposition again and prime, etc. Once you have oil on both sides you can stop.
On a first assembly, you want all the air out of the passages and oil ready to pressurize. If the engine runs before this is done, you can damage the bearings (especially cam bearings since they get fed last) before they get the oil film.
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