Export status of partial responses in progress via the API

Hi all, I'm using python to access the v3 API in Qualtrics.

I'm having no problem using _responseexports_ to get the full response set of completed responses, but can't seem to find a REST API call to get information on in progress and responses that have not yet been started.

This is a survey in which I generated individual links per respondent, but any API call to just get a list of partial responses and either the currently answered record or the recipient email / embedded data is all I need. I have the export of the links in a spreadsheet, and so even if I can programmatically get a list of users that have begun the survey would give me most of what I need to know.

Any thoughts? It seems like this should be a core part of the API.