The phrase thus far is a way of describing something that has occurred up to a certain point in time. It is often used to indicate that something has happened, but it is not yet complete or finished. For example, We have made progress thus far means that some progress has been made, but not all of the progress has been made yet.
The phrase can also be used to indicate that something is currently happening and will continue to happen until a certain point in time. For example, We have been working on this project thus far means that work has been done on the project so far and will continue to be done until it is completed.
The phrase thus far can also be used to indicate that something has not yet happened, but it is expected to happen in the future. For example, We have not seen any results thus far means that no results have been seen yet, but they are expected to be seen in the future.
In summary, the phrase thus far is used to describe something that has happened, is currently happening, or is expected to happen up to a certain point in time. It is a useful phrase for indicating progress or lack thereof.