I have been told that I will be promoted in approximately December at my job. However, the process tends to move slowly and if I don't say anything I can expect it to take an additional 2 months. There are some circumstances that would make it very sensible (IMO) for the promotion to occur right at the beginning of December. Would it be appropriate to ask my supervisor if we can plan on the promotion occurring at that time and explain why I think it would be beneficial? Or would it be better to keep my mouth shut and let things move at their own pace?
Regardless of what field the OP is in, I’m still not understanding the need to ‘nudge’ the supervisor now.
This is September. OP said she was told the promotion would probably be in December. I think asking if there's something she can do to hurry things along is a mistake.
It’s not as if the promotion is late or that OP is performing extra duties and not getting paid.
Nobody has suggested that try to hurry things along or obtain her promotion BEFORE December. Every piece of advice (as I understand it) is saying that is preferable to make sure that she understands the process (the goals she needs to meet, the paperwork her boss has to do, etc...) so that things will be set to go in December.
Even if the boss says now "Yes, you are doing great. Assuming everything continues in the same fashion, I will be recommending you for a promotion in December that will be effective by the end of January", she will know what the process is.
A promotion is not a gift you are given. It is a reward that you earn. In this case, a little entitlement is a good thing. You are entitled (as an employee) to understand the process for a promotion and, if you complete what you need to do, you are also entitled to the promised promotion.