How many have now updated to 0.13.1, they need at least 95% don't they?
Do we know if all the wallet providers are supporting the upgrade?
SegWit needs 95% of the miners to upgrade. You can look at the block version to see if the miner has updated (version is x'2000002' for SegWit). So far, I'm seeing around 1 block in 10 that has the SegWit version. So there is a long ways to go yet. I already have a SegWit transaction in the blockchain just waiting for the support to be locked in (you can create a P2SH-P2WPKH transaction but you can't spend it yet).
Signalling hasn't actually begun yet. Signalling officially begins at the start of the first retarget period after November 15th. We still have another day or two to go before we get there, then signalling officially begins and we will see lots of segwit blocks being produced.