Depends where you’re coming from. You are potentially late if the company is beyond Series A. If the company is big and ready to IPO you will get a better idea of the valuation for your RSU grant (I recommend against options at this stage as it can be a monetary burden for you at this stage, and you can get stuck with them if the IPO doesn’t perform per expectations).

Do your research on potential market cap with comparables. You should compare your Total comp. with a public company. Look at levels.fyi as an example.