are there any copies available as of now?
You can purchase here In Memory of Rav Yitzchak Abadi זצ״ל
Any update on when they will be shipped?
Should hopefully arrive in New Jersey shortly after Pesach and orders will be shipped promptly.
Can I collect the sefarim in Israel as opposed to getting them shipped to America? (Alternatively, are there any planned shipments to England/Europe?)
Yes, email me at ralph@oheltorah.com and I’ll give contact info where to purchase in Har Nof.