UPDATE: USCIS to Publish Revised Form I-539 and New Form I-539A on March 8
USCIS has revised Form I-539, Application to Extend/Change Nonimmigrant Status and will publish the revised form on the website on March 8, 2019. USCIS will be removing the 12/23/16 version of Form I-539 from uscis.gov on March 8 but will be allowing for a two-week grace period, until close of business on March 21, for that version to be received by USCIS.
The office opened at 8 and I was given a token when I entered. I was called in about 20 minutes.