If your app puts a lot of emphasis on sharing between its users, or depends on you really need to ship an Android version ASAP.
Otherwise, even though I am myself an Android engineer, I don't think you 'have to' ship an Android version as quickly as possible, especially if you don't have the means to do so.
On the contrary, wait until you are ready to pull it off.
The 2 platforms have widely different UX conventions, so just porting an app from platform A to B is not a very good idea, you might need to rethink a lot of its interactions.
One good thing about going multi-platform is that it can nudge you to clean your codebase (which is better for the long term evolution on any platform). It is harder to excuse a very shitty hack somewhere in your API when it has to be used on 2 or 3 platforms and creates problems on each of them.