You may need to wait for about 4-6 weeks after the surgery or until your wound has completely healed and your wound doesn't cause pain before you can use NeuEve suppositories.
Stitches can usually be removed within 7 to 10 days of surgery. Absorbable stitches can take longer to dissolve. It may take some time like 4 weeks after removal of stitches for your surgical wound to completely heal. Then, it will be safe to use any treatment products.
But for the balm cream, it is applied to the external vulva, which is distant from the surgical wounds. You may use the balm to the external vulva a few days after your stitches are removed.
However, if you wound has an infection, you will need to manage the infection first before you can use other products. An indication of a possible infection is pain and swelling at the surgery site.
To learn how to use the balm cream, you may find this article helpful:
I am using the Vulva balm cream for the first time. Can you please tell me where the vulva is?
After the hysterectomy, you can start with the NeuEve Silk formula. You can move up a level in 1-4 months depending on your age.