I don’t fully understand the timestamp aspect - DynGen includes two UGens - the default DynGen which offloads the compilation to a NRT thread and therefore introduces a delay of at least one block size, and DynGenRT which compiles blocking on the RT thread and is therefore available from the first sample but may introduce dropouts. See DynGenRT help for more information.
The audio sample/snippet in the previous post actually uses DynGenRT to demonstrate that one can actually use DynGenRT w/o dropouts, but if you don’t need starting from the first sample it is always better to use DynGen.