The monthly collator rewards has been created as a single Treasury Proposal (120,000 AIR) this time to avoid creating 10 individual Treasury Proposals.
The funds would be transferred to a multisig wallet and then transferred to each collator from there.
Description of the proposal on the Forum here: https://gov.centrifuge.io/t/altair-treasury-proposal-53-collator-reward-april-2023/5469