The answer is almost ready

StillThinking

Still Thinking: a tired bald character in a cream T-shirt and grey trousers, thought dots hovering overhead

He has considered every option except giving the answer.

The same character standing beside an empty office desk with a phone, a mug and a blank sheet of paper under a fluorescent light

Pending Thought

One unfinished reply has occupied the entire shift.

Long Pause

Three dots remain overhead while the opening sentence waits for a safer opening sentence to arrive.
Open Office

His eyes stay open, but the rest of the answer department has already gone home twice.
Due Eventually

Delivery is expected after every possible alternative has been reconsidered, filed, reopened, and reconsidered once more.

Still thinking. Please remain available.