Single phrase or word for someone who's about to achieve success [closed]

I would like to know the single phrase or word used for someone who's about to achieve success.

Solution 1:

Budding is close, though more like accumulating steps towards success, like a budding scientist--someone who is on their way to become a scientist.

budding

adjective

The definition of budding is something that is just starting to grow or show promise.

An example of something that would be described as budding is the new career of a talented person who shows great promise in the field.

Promising is another option that is close.

promising

adj.
Likely to develop in a desirable manner.

A phrase could be "they are so close they can almost taste it", meaning they are near to achieving success; but they could still miss it, like it could be used as, "they were so close they could almost taste it, too bad though".