As mentioned previously, the study will run itself since the participants have all the necessary information to complete the session. The main point of contact should keep track of the progress.
As the submissions come in, the UX researcher can do a quick review to ensure that the participants completed the session as expected and provided meaningful comments.
If the insights are not as useful as expected, there may be an opportunity to go back to the study participant and ask them to elaborate. If a follow-up is possible and is desired, it is best to do this as soon as possible so that the study participants still have their experience fresh in their mind.
A rookie mistake is to ask study participants to redo their session. This might come up because there is an issue with the recording, for instance. It is typically not a good idea to have a participant run...