The funding bar shows the total percentage of investment made into an asset. For instance, if the funding bar shows 96% this means that for this particular asset 96% of the total share have been bought by investors and that 4% of the total shares are remaining for investors to buy.
An asset does not need to reach 100% in order to pay out dividends, as all of our assets are already prefunded and let out. When it reaches 100% this simply means that the property is sold out in terms of shares.