....As I'm above 55, should I transfer SA+OA to FRS 55th birthday year amount shown on FRS list now or wait till CPF life payout starts and it will auto transfer the amount shown on FRS list?
OK, so my guess #2 was correct.
SA earns 4.0% interest, so there's not much point in transferring SA to RA (which also earns 4.0% interest). The pre-CPF LIFE payout auto-transfer (and any voluntary transfer now) will draw from SA first then, if necessary to meet the FRS, OA.
However, you have at least a couple other options that could be much more attractive than the future auto-transfer:
(a) If you have cash sitting in a 0.5% interest earning bank account, for example, then you can put that cash to work harder by topping up your Retirement Account. The top up limit is the current Enhanced Retirement Sum, and that's based on principal only. You may qualify for tax relief since your RA is evidently below the FRS. This'll earn 4.0% interest that'll then boost your future CPF LIFE retirement income stream.
(b) If your SA balance exceeds $40,000 then you could "shield" SA and transfer $40,000 from SA plus your OA to your RA. To the extent you draw from OA (hopefully substantially) you'll be upgrading 2.5% interest earning dollars to 4.0% RA (feeding into CPF LIFE).
(c) If you have a qualified family member (such as a spouse) then you can (usually) transfer OA to each other. For example, your spouse could transfer her/his OA to your RA, and you could transfer your OA to his/her SA (or RA if she/he is age 55+).