I cannot wrap my head around what does it mean that the OLS estimators are being normally distributed.
Say you have a population of 100m people of a particular state and you want to carry out a survey with 1k participants chosen randomly from this state. For some reason, you want to analyse the survey findings with a regression model. If you were doing this survey again and again and again with randomly chosen 1k people and fitted your regression model each time, you would get a lot of OLS estimates for your variable of interest. These OLS estimates for your variable of interest would be normally distributed.