Drive up and climb to Motel 66 Friday afternoon/evening
Camp overnight and make an earlyish start to summit 
Return to cars and drive back Saturday PM.

You can read some past trip reports here:

https://stevensong.com/coastal-interior-bc/pemberton-onwards/mount-matier-with-xinran/
https://www.francisbaileyh.com/2022/03/31/mount-matier/
https://www.cabininthesky.ca/blog/gs1zyowoc5cm5el8yzlybmy3c36014

You will need:
Crampons, Ice axe, harness, crevasse rescue kit, avi kit, stuff to camp in snow

We can discuss group gear in the planning forum.

I'd like to do this with decent weather so will likely cancel or switch to a different objective if the weather is not looking promising.  The long range forecast looks good right now but things can change.