A modelling study published by the British Medical Journal showed that having a delayed second-dose strategy with high daily immunisation rates can prevent between 26 and 47 deaths per 100,000 people compared to the usual rate.
Here's an interesting video showing lab antibody tests after the first and second jabs.
Content belonging in Megathread Although there is nothing wrong with what you have posted, for consolidation purposes and ease of reading it would be better placed in the designated Megathread for this topic.