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so an upload at midnight is probably not too useful.
some agps documents describe the procedure how to find out that gps has stale data and needs it, attached translations.
the second one has chapter "when do you need AGNSS" with enabling status NMEA message for this and " If the time stamp is valid (non-zero) and the number of valid ephemeris is large (more than 8), there is no need to download the AGNSS"
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The ephemerides are only valid for about 4 hours, so an upload at midnight is probably not too useful.
@Mark_M, the docs explicitly say CFG commands require waiting for an ACK, all others do not. The AGPS data only uses MSG commands. This is probably because the CFG commands modify flash settings, which are a lot slower than anything that just goes into RAM.