CW’s adventures of Barry Allen will Finally come to an end next year in the 9th season. The season will only be 13 episodes. With 9 seasons Flash surpasses Arrow as the longest running Arrowverse show unless you count Smallville, which was made Arrowverse Canon in the 2020 Crisis crossover.
This also means that no current tv show, after flash ends, will take place on Earth Prime of the original Arrowverse. Truly the end of a long era.