Delayed Receipt of text messages NOT coming from an I device

To activate iMessage and FaceTime using your Phone number

1. First, check to know whether you have an SMS plan enabled for at least one SMS*** with your carrier. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM to you
2. If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS. (One international SMS*** Only)
3. If you can't turn on or sign in to iMessage or FaceTime - Apple ...

*** You may not have an SMS plan (Domestic & International) enabled by your carrier for the SIM/eSIM that you use on your device. Apple Inc. does not provide SMS services.

UncleZamboni wrote:

Text messages NOT coming from an apple device are being delayed for multiple hours. The message is not seen on my iPhone, iPad or MacBook Air. I can send and receive messages with someone using an I device without issue.

You can troubleshoot here If you can't send or receive messages on your iPhone or iPad - Apple Support

If the link doesn't work, then report the issue to your cellular data provider, SMS is their feature.