We went through the COVID mumbo jumbo, travel bans that were interpreted by DOS as visa bans, etc. And an election year! For the OP, as well as anyone reading this going thru similar steps in their process, you would do well to heed MarJhi's advice.
Trump's administration changed the K1 + AOS process. Some changes were reversed (for example, look up the form 944 Declaration of Self Sufficiency). Other changes were not.
A friend of mine completed her K1+AOS process several years ago, before the Trump administration's more permanent changes took effect.
Her entire K1 process was six months from when they sent the petition to when she arrived on U.S. soil. When she applied for her green card she was required to simply include her marriage certificate, proving she complied with the requirements of the K1 visa. Her green card was approved, no interview, and in no more than three months.