Yes, it's normal. There may be safety updates ("recalls") at any time which would be considered to be mandatory so they get pushed out.
The .x00 series seems to be used for cars which are recently put in service, I presume there may be extra diagnostics collected so they can see if any process changes in the factory resulted in any problem (or fixed them).
At some point, maybe a month or two in, you will get an upgrade to the normal mainstream version.
By the way, the update message always says '25 minutes', which often may not be exactly true.