Older siblings with newborn?

bea
My son is 2 years old and im due this month with a baby girl. I have bought my son a few small presents from his new sister that he will get when he first meets her.. I didn't spend much and they are things that i can make and do with him aswell as a small item to entertain himself.. My partner's family are saying that this is a ridiculous thing to do blah blah blah.. I think it will help with the transition. Are there any other ways i can involve my son and help him feel included and not pushed out when baby arrives? Has anyone else gotten a gift for older sibling(s)? Interested to hear what worked for other families!!