Refers to a specific temporal reference point, often used in formal or business contexts to mark when something happens or is measured.
At this point in time, nothing has been decided yet.
At the time of the contract, those terms were valid.
By the time the contract was signed, the terms had already been decided.
At this point, we still don't know the result.
An email will be sent at the point when the application is completed.
It's too early to judge at that point.
瞬間 means a brief 'instant' or 'moment', whereas 時点 simply marks a point in time without implying shortness.
段階 refers to a 'stage' or 'phase' in a process, while 時点 pinpoints a specific moment rather than a stage of progress.
at the present time; at this point in time
at the time of writing; as of this writing
base point in time; reference time; epoch
point of sale; POS
Compound of 時 (time) and 点 (point), literally 'time point'. The reading じてん is standard Sino-Japanese.