Biometric employee time reader?

Question

Biometric identification

A company (10-15 people) needs a system for tracking working time with reference to a specific project.
The point is that the system itself calculates the employee’s working time, and he can only distribute it among projects from the list (for example: he worked 7 hours 41 minutes today. 3 hours of them worked for project No. 122, and the rest of the time for No. 133). I have already read a lot of things, but I can’t choose / find something specifically. It is important to deploy this as soon as possible (employees lie / make mistakes - money flows through their fingers), but on a budget (they will order a full-fledged system later, perhaps). Alternatively, there is a tablet on Android and a computer from under Windows (you can put anything).
We thought about buying some kind of fingerprint scanner for a computer (laptop), but now we are not sure about the quality of work ... it would be good to attach a camera to it in order to identify it by the eyes, but in both cases you need suitable software.
Tell me something, please! And then they were completely lost ...
PS- there is an opportunity to order on Amazon and Ebay with prompt delivery.