Hello 2021bryant
Is it on a Saturday or Sunday?
That’s indeed too tight.
Check with Glacier Express customer service if you can change the reservation for the 09:52 departure: https://www.glacierexpress.ch/en/contact/?
Otherwise, you could travel to Brig and board the 08:52 Glacier Express at Brig. But again, you would have to notify the Glacier Express customer service so they keep the seats for you and do not assume you are a no-show. And you are going to miss the Zermatt to Brig part.
Kind regards,
Roland