Anthony Towns shared that Taproot is activated on Testnet.
I am not sure if we can create P2TR outputs easily on Testnet right now based on this Q&A by Michael Folkson:
I am interested in reviewing PR: https://github.com/bitcoin/bitcoin/pull/22421 and test
utxoupdatepsbt on Testnet with PSBT spending Taproot outputs.
- December 26, 2019