The phrase "snapshot in time" means capturing a specific moment or situation at a particular point, just like taking a photo. It represents a frozen or still image of a particular instance. Full definition
The plan to extend the current board structure for another year represents a state capital snapshot in time. (bloodhorse.com)
Because the current standing paints a frozen snapshot in time of a community's credit score, it is perhaps more revealing to look at the trajectory of credit scores. (valuepenguin.com)
Keep in mind, however, that these monthly updates are just snapshots in time. (mrfreeat33.com)