all my co-workers

[color=indigo]1-I want to thank all my co-workers.

Does this mean:
[color=red]a-I want to thank all the people who are my co-workers now.
or could it mean:
[color=blue]b-I want to thank all my co-workers over the years?

Gratefully,
Navi.

It depends on the context. Without a context it’s not possible to tell.