Here's my long answer with some analysis
the EO changing martial law was signed in March and it stated that the changes would not be in effect until 1/1/2019
that indicated to me that no arrests would happen in 2018, because the indictments can't be prosecuted successfully with corrupt Federal judges and US Attorneys, but have to be prosecuted in military tribunals
the other thing is optics to prevent a possible civil war in America… the present state of Congressional investigations have not been convincing enough, to Democrats and independents and the MSM, largely because declassification of the necessary documents hasn't been requested until October, and then declassification was promised after the election
now the hearings have to continue in the Senate, since the House was lost in the election and the House committee is going to be shut down by the new Democrats, so the declassified documents will have to be released by the Senate committee
this means that 3 to 6 months from now, the optics may finally be changed to the extent that arrests would not be met with riots, etc.
that assumes more delaying tactics I haven't foreseen and also RGB has said she is stepping down from SCOTUS in January, so that means another extended fight to confirm another SC nominee
that makes it plausible to me the first ones will be in 6 months to a year