The set of vulnerabilities is dubbed PHP2Shell and disclosure is scheduled for 14:00 UTC with attacks expected to follow soon after.
It is adviced to take offline every non-vital services until the patch has been installed (or the Docker image has been updated with a patched version of PHP)
They took a lot longer than that on some past vulnerabilities, some of them sat unpatched for weeks or months. But it depends on the severity. A remote exploit of severity 9 will probably get expedited.