No milk on first day of giving birth

Hi mummies! I have been pregnant a few times and All those times my i wont have milk on my first day of delivery. No matter how i latch, supply will come the next day. And first day hospitAl will feed my lo with formula (no choice). And im currently pregnant again (38 wks now), so any tips to get/stimulate breast milk even even before i give birth? So on first day i would hAve milk.