I guess what you could do is use an Integromat Data Store as temporary storage, and set up a workflow something like the following:
- Incoming Webhook from Glide is processed and a record created in the data store. This record should include a timestamp that indicates when the rest of the process should be triggered.
- Create a second scenario that runs on a regular schedule. This scenario would iterate through the records in the data store and check the timestamps. For any that are due, it could send the SMS and do whatever other actions are necessary.
One downside with the above is that it could be quite expensive (and wasteful) in terms of your operations count. There is probably a better way, maybe someone else will jump in with another suggestion.