Gregory's Server"AFAIK the delay for SEPA is always 1 bank working day"
Not in my experience. I sent money in the evening and it was there next morning, even from one country to another. And I have sent money in the morning and it arrived in the afternoon. Some banks are slower, though.
Many already support SCT Inst, and soon they must. From 2025/01/09 all banks in SEPA must support receiving and from 2025/10/09 they must support sending. So at most another year until the ordeal is over.