Polls: Education & Career

NOTE: THIS SAME COMPANY JUST ANOTHER DEPARTMENT

I am now working in a customer service under Airline account. It is my first time to work in a customer service job because my experience was purely back office like finance and operations. I am struggling to this job and even the supervisor know about it for sure.

I applied to another department that is back office operation under the same project Airline (but purely back office not customer service) and passed the excel exam and got final interviewed. I told them that my supervisor didn't know about my application because I am not yet sure if I will be hired. And, they said the hr will just inform me if I am hired and will advice the next step for me and do proper communication.

My question is, should I tell my supervisor that I was interviewed by other department in back office position now OR should I wait until there is already announcement that I am hired before I tell the supervisor?

I am so confused if I tell now, he might support me to my transfer, If I tell now, he might dislike me and do some troubles for me especially if I am not hited.

If I tell later after I am hired, he might be so mad at me or think I disrespect him.

(NEED ADVISE FROM PEOPLE)

I'm at the point where i need to start deciding what i want to do as a job/what to study and there's a few jobs that sound interesting but i don't know how to pick from them, they all interest me lol

not going to pick based off this or anything, just asking what you guys would pick

If someone texts you (a reference) an update about their job hunt (where they've applied, from whom you might hear, etc.), and then ends the text with thanks and I hope you're enjoying the summer with a smiley face, is a reply warranted? Or is it rude/unprofessional not to reply?