Well, we will be in line for the booster once one gets approved. I realize, out of the three vaccines only Pfizer has full approval for the basic vaccine and emergency approval for the booster which is now available for those who have had the first two shots and are over 65.
We have had both Moderna's but neither Moderna nor J & J have full approval for the basic vaccination yet from the FDA. It might take a while for them to okay a booster for Moderna as well, since the jury is still out as to when and if one should have such a booster. Pfizer recommends their booster be taken after about 6 months after the second dose but most experts seem to agree that should be 8 months.
When a Moderna booster is approved it could be even longer than 8 months from the second dose due to the following study----
"Data collected from 18 states between March and August suggest the Pfizer-BioNTech vaccine reduces the risk of being hospitalized with COVID-19 by 91% in the first four months after receiving the second dose. Beyond 120 days, however, that vaccine efficacy drops to 77%.
Meanwhile, Moderna’s vaccine was 93% effective at reducing the short-term risk of COVID-19 hospitalization and remained 92% effective after 120 days. Overall, 54% of fully vaccinated Americans have been immunized with the Pfizer shot."