I'm assuming you just leased it? Why the conversion so soon? It may be worth continuing your lease into the new year to find out the rules of this upcoming $4,000 Federal Used EV rebate. If you are getting a traditional loan with a good rate, maybe worth doing.
Limited details right now on the web, but the way I see it, GM is the 1st owner of your car, and you are the lessee "renter". Hopefully lease buyouts qualify as 2nd buyer. The used car transaction is required through a licensed dealer and they are required to submit to Dot.gov for you. Vehicle must be in service by first owner for 24 months, and there is a $25,000 cap on the selling price. Most Dealers wont make their first submission for 25 months. However, you are already a few months in, but I suspect you wont be under $25K until 30 months or so. Look for the end-of-lease buyout price on your contract.
You can call for a buyout on your lease at any time, just like conventional financing. You can also sell your leased car to your dealer for a higher price than the buyout. I've done it many times on high resale value trucks -- and they did the paperwork for me, and cut me a check back! I did pay their Doc fee.
Traditionally, GM leasing is the most easy-going with buyouts, the Financial holder only cares about "paid in full", whether for the month or full contract.
Hope this helps