These guys run 100 Tesla thru each day. One of the busiest Service centers in the country.
When mine was there the kept me in constant text updates. Noted when work on it started, when it was completed and even notified me that they were no longer washing all the serviced vehicles due to environmental issues. (maybe also because so many owners asked that their cars not be washed).
Maybe there is just nothing to report in your case. Common for Tesla to go radio silence until they have a pick up time for your car.