Hi Katy,
I see you are scheduled for radiation treatment. Hopefully , that's all that you will require. Try not to worry about whether any other surgery may be required in the future. A total Glossectomy is the removal of the entire tongue. This type of surgery is a last resort or salvage surgery for a recurrence of tumour.
You are no where near this.
Prepare yourself well for the radiation,I'm sure you will have read up and been given lots of advice already.
Don't worry about things that may never happen.
Kris and I have walked that particular road.
Take care,
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!