Yes.
All seven thank-you extensions are built on Shopify's Checkout UI Extensions framework and work with both the legacy and current checkout.
What this means
You don't need to worry about Shopify's checkout migration deadline. The Oxify thank-you widgets are already on the new framework — they'll continue working when Shopify forces every store to Checkout Extensibility.
Two surfaces, both supported
Thank-You page — Right after checkout.
Order Status page — Persistent in the Customer Account hub.
Both are powered by the same Checkout UI Extensions framework.
Tip
If you previously used a thank-you app that hasn't migrated to Checkout Extensibility yet, you'll need to switch tools before Shopify's deadline. Oxify's thank-you widgets are already a safe replacement.