Mining pools occasionally mine "empty blocks" when they find a sufficiently low hash in the brief time-frame between hearing about a new block, verifying the new block, and pushing out new block templates to build on top of it to the miners. These blocks will often be "empty" in the sense that they will only contain the mandatory coinbase transaction. Since the coinbase transaction only has to have a witness commitment if the block includes any transactions with witness data (see BIP141), we can't tell for empty blocks whether they were mined by segwit or non-segwit miners. So given that the coinbase transaction doesn't necessarily contain any segwit data, I would not count these empty blocks as bonafide "non-segwit" blocks.
I would therefore interpret your question as asking for the last block that included more transactions than just the coinbase transaction, but did not include any transactions with witness data. This is what I found, when I searched for blocks fulfilling those criteria:
The latest such block was mined on 2020-04-18 at height 626,507. This block had three transactions, two non-segwit transactions, and a coinbase transaction. I've verified that the coinbase transaction of block 626,507 does not have a witness commitment, so it's a bonafide non-segwit block.
Now you might say: "But wait, only two additional transactions? That were probably just new transactions the mining pool sent, so they were sure that nobody else could have included them yet, and it's really basically an empty block".
In that case, the last non-segwit block was 616,561 which had 2,992 transactions, but not a single transaction among them has any witness data. Neither does the coinbase transaction have a witness commitment.
Given that both these blocks are almost and more than two years old, I think it's safe to say that the network today has no non-segwit hashrate (or it is only mining empty blocks).
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