Can I sell my cellular iPad before the line gets disconnected?

I have an Older iPad 9th Gen data plan I pay monthly for (and yes the iPad is paid off). I tried canceling that line because I literally never use the iPad and I have no use for it ever since I closed my secondary retail stand.

I tried to disconnect the line on My Verizon app and was able to but it says it won't disconnect until the effective date of February 22 which is almost a month away. I already deleted the eSIM on it and factory reset the iPad and I have it ready to sell on the marketplace. Can I still sell it? Or do I have to wait until after the service gets disconnected on it officially? If I do sell it will it affect the buyers ability to connect if they wish to put cellular service on it? Just want to know since I've never done this before? Or can I call them to disconnect the service faster? Thanks