Sort of. Assuming the first reservation number given out to the public was 10004000 (could have been 10004001), that is the first place in line. However, there are some important other factors:
What package was 10004000?
Has it been converted to an order?
In reality, it appears that 10004000, 10005000, and 10006000 (and maybe even 10007000) were available simultaneously at the time of the release. That means that for the first few days, numbers are sequential within each block with multiple simultaneous blocks.
If 10004000 was a First Edition reservation and it was converted to an order by the 8/31 cutoff, then yes, it should be the first produced among the public reservations.
If 10004000 was a Premium reservation and it was converted to an order by the 8/31 cutoff, it should be the first produced after all the First Editions. Probably two or three weeks after the first FE.
If 10004000 was a Select or CA Route 1 reservation and it was converted to an order by the 8/31 cutoff, we really don't know. Originally these weren't supposed to come out until 2021 but that's been changed. At some point, Ford has to switch from producing North American deliveries over to EU/UK deliveries. We don't know if the NA Select and CA Route 1s come before or after the EU/UK FEs and Premiums.
For more, see my latest at
Production runs & line output guesstimates and the post after it.