Final stage of hiring, small discrepancy in current role, am I overthinking this?

I’m in the final stage (top 2 candidates) for a Helpdesk role, and I could use some honest advice.

During my interviews, I mentioned that my current role is basically full-time with a mix of on-site and remote work. The reality is I work on-site 2-3 days a week with no remote work, but the rest isn’t structured “official” work days it’s more of a flexible/on-demand setup ( which I rarely get called on for extra office days).

The responsibilities and actual work I do are exactly the same regardless. I've been in this role for around 1.5 years.

They’re now doing reference checks for my previous role (which I’m confident about), they’ll later ask for a reference from my current role once they are ready to give me an offer.

The reason I lied was simply because if I did mention that my role is not really a full 5days of work and looks more like a part time role, I 100% would not have been in the final stage right now, knowing how hiring works here ( there was literally 3100 applicants for this role.)

All the responsibilities and work done during this period that I've mentioned during the interview is true, only difference is how often.

My question is:
How big of a deal is this kind of discrepancy at this stage? Is this something that could realistically cost me the offer, or am I overthinking it?

Final stage of hiring – small discrepancy in current role, am I overthinking this?
My worry is also when they contact my current job references and they somehow find out my job was actually only 2-3 days weekly and other days I am technically off.

Also, if it does come up later, is it better to clarify it proactively or just keep it framed as a flexible role?

Would appreciate honest opinions, especially from people in IT or hiring roles. My final interview is in 6 days time and am losing my mind.