Welcome to HCM.
You have not mentioned the exact thickness of the endometrium. If it is above 14 mms. then it is significant.
You will need to get a PAP smear
done as well.
If PAP smear is negative for malignant cells then instead of uterus
removal you could get a D & C done and send the curetings for histo-pathological examination. If that does not show any features of malignancy then uterus removal is unnecessary.
Wishing you all the best.