Sounds like delays increased above the forecast peak, which should technically be communicated as a "hazard alert" (AIP GEN 3.3 2.5.4)
However be aware that once the NOTAM is issued the ATC requirement to provide alerting ceases. If you are using a static source (e.g. printed PFIB) and the NOTAM is issued one minute after you obtained it, don't expect any further ATC advice.