Just received that word myself.
Everyone should be on ACIF V4.6.
Ed
I found out the longer answer:
Given that ACIF is a feature of PSF, PSF/ACIF 4.5 End of Service date was September 30, 2019.
https://www-01.ibm.com/common/ssi/cgi-bin/ssialias?subtype=ca&infotype=an&appname=iSource&supplier=897&letternum=ENUS918-095 (https://www-01.ibm.com/common/ssi/cgi-bin/ssialias?subtype=ca&infotype=an&appname=iSource&supplier=897&letternum=ENUS918-095)
Ed