Daily Mail has posted several pics that caught Emma Watson on the set of Greta Gerwig's Little Women. Below are just a couple:
Watson portrays eldest March sister, Meg, and filming is currently underway near Boston. I have no idea what Meryl's filming schedule will be. I imagine that her contract likely condenses the time she has to be on set. So for all we know, she could film all her scenes in the matter of a few days.
When she does eventually shoot some scenes, hopefully we get similar snapshots from the set!