I wasn't watching the advance of the anti-tree armies personally (they were going too far for me to follow even with an astral projection unless I left Hive Supremo again, and I was doing this too often in the last few days).
However, the entire Empire Council was tracking their progress with great interest based on transmissions from the telepathic messengers. They were received by Attendant Bearerma, who stood near a map spread on the Council's table.
The Attendant was listening to the messages and accordingly moving a wooden piece that reflected the anti-tree army. Right now, it has almost approached the first grove of the ice-hole trees—those who were constantly sending their seeds flying our way.