For the last week, I've been hearing a strong hiss coming from up front upon acceleration. It seems to coincide with the turbo spooling up. Today, I found that the hose which I believe to be the one going from the wastegate actuator over to the top of the turbo is severed and hanging there. Am I correct that this is the source of the noise?

Must I replace this hose immediately or is it okay until the next service (in a week or two)? Doesn't look like a big deal to change.
Is there a specific part that I need to pick up for this?
Thank you in advance!