Star Trek: Discovery season 2 ended with the characters enacting their plan to prevent Control gaining access to the Sphere data onboard the Discovery by attempting to launch Discovery into the future out of its reach.
While going about the mission,
Control is defeated by Georgiou and neutralised (this is confirmed by co-creator and co-showrunner Alex Kurtzman (fourth quote in the article)). Importantly, this defeat occurs before Discovery enters the wormhole.
Why was it then necessary to continue with the mission of going through the wormhole?
Control is gone, it can't access the data. Even if Control wasn't destroyed and remained in the past while Discovery successfully travelled to the future, it's an incredibly advanced AI as it is, probably capable of playing the waiting game and lying dormant for however many years it takes for Discovery to re-emerge from the wormhole.
As a further point, if Georgiou had failed in killing Control (which wasn't a guaranteed victory, it appeared to have the upper hand most of the fight) it would have travelled into the future with the data, so the mission objective should have changed once Control beamed aboard.