Can I transfer assets to Coinbase before a listing is announced?

I'm curious about the logistics of asset transfers prior to a listing announcement. Could you elaborate on the feasibility of transferring assets to Coinbase before an official listing is made public? Are there any potential risks or limitations I should be aware of? Additionally, what are the typical steps or processes involved in transferring assets to Coinbase? And finally, would it be advisable to wait for the listing announcement before making such a transfer, or is it generally SAFE to proceed in advance?