How to check if a materialised view is being updated?

Hi.
I’ve got a materialized view as a source for my ETL-process, and the materialized view takes several hours to refresh. During which it is locked for queries.
So I’m looking for a way to identify if the refresh process is finished or if it’s still running - preferably without having to wait for timeout by querying a locked materialized view. But by e.g. using the system tables or otherwise.

Can anybody suggest some pointers on how to do this?

I’m using PostgreSQL 11.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit

Thanks,

Bjørn

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