Checked all T-Bill yields in DeFi and have to say that @SkyEcosystem (MakerDAO) has the best offering

First of all, they offer the highest yield of 6% but the best thing is that they offer instant 1:1 liquidity

Other options like

@MountainUSDM @OndoFinance @AnzenFinance @CygnusFi @OpenEden_Labs @BackedFi @fraxfinance @usualmoney @Hashnote_Labs (Hashnote is the only option that has instant liquidity in PYUSD)

in the best-case scenario offer a liquidity pool or the 1 day delay.

For DeFi integrations you require atomic redemptions which is almost not possible due to the nature of RWAs. Unless treasuries move on-chain