No one knows but also maybe the dev will have a set price for their token when it listed on exchange. But we don't know if they can sustain that since for sure when it listed on exchange a huge selling pressure might came since for sure those people who already have those tokens and can able to sell will do massive selling since many want to secure their profits at early listing.

For thinking about buying it when selling pressure is done well maybe this is good idea but you also need to know if the dev had plan for continuous development of there project.