This signaling method follows a soft fork deployment framework called Speedy Trial, in which miners and mining pools help coordinate the upgrade.
The soft fork gets locked in for activation if 90% of all blocks mined in the difficulty adjustment window of 2,016 blocks include the activation signal.
The network has to achieve this consensus in one of the difficulty adjustment epochs between May and August to lock Taproot in as a protocol upgrade for block 709,632, which is expected in November.