Well form the temps you have posted I would expect puppies within 24hrs.
Are you all ready?
If you have had puppies before it is the same, except yorkies need help and I always clean and get the puppies breathing while Mom licks and helps.
Same as Labs, watch for digging, not eating, panting and of course peeing a lot with nothing coming out
Feel free to contact me directly with any question or problems'
yorkies4ever@juno.com
sparklingbluyorkies.com