Effective August 28, as it becomes safe to resume more consular operations at each U.S. mission, posts are authorized to give K visa cases high priority. Applicants should check the website of their nearest U.S. Embassy or Consulate for updates on what services that post is currently able to offer. The I-129F Petition for Alien Fiancé(e) is typically valid for four months; however, consular officers may revalidate the I-129F petition in four month increments. For most cases impacted by the suspension of routine visa services or COVID-19 travel restrictions it will not be necessary to file a new I-129F petition.
DOS Link: https://travel.state.gov/content/travel/en/News/visas-news/important-notice-for-k-visa-applicants-affected-by-covid-19.html