I called 1-800 number to check how useful is their service. What they really did - they changed menu options. At the end, after reaching my case status option, I heard that processing of my type of cases takes 90-180 days.
This was something unexpected, because we already had this message 5 months ago.
Anyway I wanted to talk to a representative about projected processing times for I-140. She said that it is 13 months. I told her that 13th anniversary of my petition will occur this week.
Finally, the only advice was to contact Vermont Service Center, which could be done only by mail starting June 1.